diff --git a/README.md b/README.md
index 569e33a..7ca2dc4 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,7 @@ __Note:__ This feature is actually not enabled by default.
 
 ###### TF-IDF / BM25?
 
-> "TF-IDF and all kinds of variations (like BM25) is a big mistake in searching algorithm today. They does'nt provide either: a meaningful relevance of a term as well as the importance of it! Like many pseudo-intelligent algorithm this is also an example of mathematical stupidity." — Thomas Wilkerling, _Contextual-based Scoring_, 2018
+> "TF-IDF and all kinds of variations (like BM25) is a big mistake in searching algorithms today. They don't provide neither: a meaningful relevance of a term nor the importance of it! Like many pseudo-intelligent algorithms this is also just an example of mathematical stupidity." — Thomas Wilkerling, _Contextual-based Scoring_, 2018
 
 <a name="webworker"></a>
 #### Web-Worker Support
diff --git a/flexsearch.js b/flexsearch.js
index 4ef0b01..5e72a12 100644
--- a/flexsearch.js
+++ b/flexsearch.js
@@ -266,7 +266,7 @@ var SUPPORT_ASYNC = true;
 
             //if(options){
 
-            options || (options = defaults);
+                options || (options = defaults);
 
                 var custom = options['profile'];
                 var profile = custom ? profiles[custom] : {};
@@ -279,10 +279,10 @@ var SUPPORT_ASYNC = true;
 
                         options['worker'] = false;
 
-                        if(SUPPORT_ASYNC){
-
-                            options['async'] = true;
-                        }
+                        // if(SUPPORT_ASYNC){
+                        //
+                        //     options['async'] = true;
+                        // }
 
                         this._worker = null;
                     }
@@ -295,11 +295,14 @@ var SUPPORT_ASYNC = true;
                         self._task_completed = 0;
                         self._task_result = [];
                         self._current_callback = null;
+                        //self._ids_count = new Array(threads);
                         self._worker = new Array(threads);
 
                         for(var i = 0; i < threads; i++){
 
-                            self._worker[i] = add_worker(self.id, i, options || defaults, function(id, query, result, limit){
+                            //self._ids_count[i] = 0;
+
+                            self._worker[i] = add_worker(self.id, i, options /*|| defaults*/, function(id, query, result, limit){
 
                                 if(self._task_completed === self.worker){
 
@@ -317,6 +320,7 @@ var SUPPORT_ASYNC = true;
                                 if(self._current_callback && (self._task_completed === self.worker)){
 
                                     // store result to cache
+                                    // TODO: add worker cache, may remove global cache
 
                                     if(self.cache){
 
@@ -326,6 +330,8 @@ var SUPPORT_ASYNC = true;
                                     self._current_callback(self._task_result);
                                     self._task_result = [];
                                 }
+
+                                return self;
                             });
                         }
                     }
@@ -433,10 +439,11 @@ var SUPPORT_ASYNC = true;
              */
 
             this._timer = null;
-            this._status = true;
 
             if(SUPPORT_CACHE) {
 
+                this._cache_status = true;
+
                 this.cache = custom = (
 
                     options['cache'] ||
@@ -557,7 +564,10 @@ var SUPPORT_ASYNC = true;
 
                     if(SUPPORT_WORKER && this.worker){
 
-                        if(++this._current_task >= this._worker.length) this._current_task = 0;
+                        if(++this._current_task >= this._worker.length){
+
+                            this._current_task = 0;
+                        }
 
                         this._worker[this._current_task].postMessage(this._current_task, {
 
@@ -568,9 +578,15 @@ var SUPPORT_ASYNC = true;
 
                         this._ids[id] = "" + this._current_task;
 
+                        // TODO: improve auto-balancing
+                        //this._ids_count[this._current_task]++;
+
                         return this;
                     }
 
+                    // collect tasks for non-blocking processing
+                    // TODO: actually auto-enabled in worker
+
                     if(SUPPORT_ASYNC && this.async){
 
                         this._stack[id] || (
@@ -766,7 +782,11 @@ var SUPPORT_ASYNC = true;
                     // update status
 
                     this._ids[id] = "1";
-                    this._status = false;
+
+                    if(SUPPORT_CACHE){
+
+                        this._cache_status = false;
+                    }
                 }
             }
 
@@ -801,14 +821,16 @@ var SUPPORT_ASYNC = true;
 
                 if(SUPPORT_WORKER && this.worker){
 
-                    var int = parseInt(this._ids[id], 10);
+                    var current_task = parseInt(this._ids[id], 10);
 
-                    this._worker[int].postMessage(int, {
+                    this._worker[current_task].postMessage(current_task, {
 
                         'remove': true,
                         'id': id
                     });
 
+                    //this._ids_count[current_task]--;
+
                     delete this._ids[id];
 
                     return this;
@@ -844,7 +866,10 @@ var SUPPORT_ASYNC = true;
 
                 delete this._ids[id];
 
-                this._status = false;
+                if(SUPPORT_CACHE){
+
+                    this._cache_status = false;
+                }
             }
 
             return this;
@@ -928,27 +953,26 @@ var SUPPORT_ASYNC = true;
             /** @type {!string|Array<string>} */
             var _query = query;
 
-            // invalidate cache
+            if(SUPPORT_CACHE && this.cache){
 
-            if(!this._status){
+                // invalidate cache
 
-                if(SUPPORT_CACHE && this.cache){
+                if(!this._cache_status){
 
                     this._cache.reset();
+                    this._cache_status = true;
                 }
 
-                this._status = true;
-            }
+                // validate cache
 
-            // validate cache
+                else {
 
-            else if(SUPPORT_CACHE && this.cache){
+                    var cache = this._cache.get(query);
 
-                var cache = this._cache.get(query);
+                    if(cache){
 
-                if(cache){
-
-                    return cache;
+                        return cache;
+                    }
                 }
             }
 
@@ -1153,7 +1177,7 @@ var SUPPORT_ASYNC = true;
                     'items': items,
                     'sequences': words,
                     'chars': chars,
-                    'status': this._status,
+                    //'status': this._cache_status,
                     'cache': this._stack_keys.length,
                     'matcher': global_matcher.length,
                     'worker': this.worker
diff --git a/flexsearch.light.js b/flexsearch.light.js
index 4a6eb85..ec1fec6 100644
--- a/flexsearch.light.js
+++ b/flexsearch.light.js
@@ -7,13 +7,13 @@
 'use strict';(function(d,v,n){var t;(t=n.define)&&t.amd?t([],function(){return v}):(t=n.modules)?t[d.toLowerCase()]=v:"undefined"!==typeof module?module.exports=v:n[d]=v})("FlexSearch",function(){function d(a){"string"===typeof a&&(a=B[a]);a||(a=x);this.id=a.id||G++;this.init(a);v(this,"index",function(){return this.a});v(this,"length",function(){return Object.keys(this.a).length})}function v(a,b,c){Object.defineProperty(a,b,{get:c})}function n(a){return new RegExp(a,"g")}function t(a,b,c){if("undefined"===
 typeof c){for(c=0;c<b.length;c+=2)a=a.replace(b[c],b[c+1]);return a}return a.replace(b,c)}function z(a,b,c,e,f,p,g){if("undefined"===typeof b[c]){var h=f?(9-(g||6))*p+(g||6)*f:p;b[c]=h;h>=g&&(a=a[h+.5|0],a=a[c]||(a[c]=[]),a[a.length]=e)}return h||b[c]}function A(a,b){if(a)for(var c=Object.keys(a),e=0,f=c.length;e<f;e++){var p=c[e],g=a[p];if(g)for(var h=0,k=g.length;h<k;h++)if(g[h]===b){1===k?delete a[p]:g.splice(h,1);break}else"object"===typeof g[h]&&A(g[h],b)}}function C(a){var b=[];if(!a)return b;
 for(var c=0,e=0,f=0,p="",g=a.length,h=0;h<g;h++){var k=a[h];"a"===k||"e"===k||"i"===k||"o"===k||"u"===k||"y"===k?c++:e++;" "!==k&&(p+=k);if(" "===k||c>=(8<g?2:1)&&2<=e||2<=c&&e>=(8<g?2:1)||h===g-1)p&&(b[f]&&2<p.length&&f++,b[f]=b[f]?b[f]+p:p," "===k&&f++,p=""),e=c=0}return b}function H(a,b){a=a.length-b.length;return 0>a?1:0<a?-1:0}function I(a,b){a=a.length-b.length;return 0>a?-1:0<a?1:0}function J(a,b,c){var e=[],f=[],p=a.length;if(1<p){a.sort(I);for(var g={},h=a[0],k=h.length,y=0;y<k;)g[h[y++]]=
-1;for(var q,d=0,m=1;m<p;){var l=!1,n=m===p-1;f=[];h=a[m];k=h.length;for(y=-1;y<k;){var r=g[q=h[++y]];if(r===m){if(n&&(e[d++]=q,b&&d===b))return e;l=!0;g[q]=m+1}else c&&(r=f[r]||(f[r]=[]),r[r.length]=q)}if(!l&&!c)break;m++}if(c&&(b||(b=1E3),d=e.length,k=f.length,d<b&&k))for(m=k-1;0<=m;m--)if(q=f[m])for(y=0;y<q.length;y++)if(e[d++]=q[y],b&&d===b)return e}else p&&(e=a[0],b&&e.length>b&&(e=e.slice(0,b)));return e}var x={encode:"icase",mode:"forward",f:!1,cache:!1,async:!1,j:!1,threshold:0,depth:0},B=
+1;for(var q,d=0,m=1;m<p;){var l=!1,n=m===p-1;f=[];h=a[m];k=h.length;for(y=-1;y<k;){var r=g[q=h[++y]];if(r===m){if(n&&(e[d++]=q,b&&d===b))return e;l=!0;g[q]=m+1}else c&&(r=f[r]||(f[r]=[]),r[r.length]=q)}if(!l&&!c)break;m++}if(c&&(b||(b=1E3),d=e.length,k=f.length,d<b&&k))for(m=k-1;0<=m;m--)if(q=f[m])for(y=0;y<q.length;y++)if(e[d++]=q[y],b&&d===b)return e}else p&&(e=a[0],b&&e.length>b&&(e=e.slice(0,b)));return e}var x={encode:"icase",mode:"forward",f:!1,cache:!1,async:!1,i:!1,threshold:0,depth:0},B=
 {memory:{encode:"extra",mode:"strict",threshold:7},speed:{encode:"icase",mode:"strict",threshold:7,depth:2},match:{encode:"extra",mode:"full"},score:{encode:"extra",mode:"strict",threshold:5,depth:4},balance:{encode:"balance",mode:"ngram",threshold:6,depth:3},fastest:{encode:"icase",mode:"strict",threshold:9,depth:1}},w=[],G=0,D=n("[ -/]"),E={},F={};d.new=function(a){return new this(a)};d.create=function(a){return d.new(a)};d.registerMatcher=function(a){for(var b in a)a.hasOwnProperty(b)&&(w[w.length]=
-n(b),w[w.length]=a[b]);return this};d.registerEncoder=function(a,b){u[a]=b;return this};d.registerLanguage=function(a,b){E[a]=b.filter;F[a]=b.stemmer;return this};d.encode=function(a,b){return u[a].call(u,b)};d.prototype.init=function(a){this.i=[];a||(a=x);var b=a.profile;b=b?B[b]:{};this.mode=a.mode||b.mode||this.mode||x.mode;this.threshold=a.threshold||b.threshold||this.threshold||x.threshold;this.depth=a.depth||b.depth||this.depth||x.depth;this.f=a.suggest||this.f||x.f;this.c=(b=a.encode||b.encode)&&
-u[b]||("function"===typeof b?b:this.c||!1);(b=a.matcher)&&this.addMatcher(b);if(b=a.filter){b=E[b]||b;var c=this.c,e={};if(b)for(var f=0;f<b.length;f++){var p=c?c.call(u,b[f]):b[f];e[p]=String.fromCharCode(65E3-b.length+f)}this.filter=e}if(b=a.stemmer){a=F[b]||b;b=this.c;c=[];if(a){e=0;for(var g in a)a.hasOwnProperty(g)&&(f=b?b.call(u,g):g,c[e++]=n("(?=.{"+(f.length+3)+",})"+f+"$"),c[e++]=b?b.call(u,a[g]):a[g])}this.stemmer=c}this.g=[{},{},{},{},{},{},{},{},{},{}];this.b={};this.a={};this.h=!0;return this};
-d.prototype.encode=function(a){a&&w.length&&(a=t(a,w));a&&this.i.length&&(a=t(a,this.i));a&&this.c&&(a=this.c.call(u,a));a&&this.stemmer&&(a=t(a,this.stemmer));return a};d.prototype.addMatcher=function(a){var b=this.i,c;for(c in a)a.hasOwnProperty(c)&&(b[b.length]=n(c),b[b.length]=a[c]);return this};d.prototype.add=function(a,b,c){if("string"===typeof b&&b&&(a||0===a))if(this.a[a]&&!c)this.update(a,b);else{b=this.encode(b);if(!b.length)return this;c=this.mode;b="function"===typeof c?c(b):"ngram"===
+n(b),w[w.length]=a[b]);return this};d.registerEncoder=function(a,b){u[a]=b;return this};d.registerLanguage=function(a,b){E[a]=b.filter;F[a]=b.stemmer;return this};d.encode=function(a,b){return u[a].call(u,b)};d.prototype.init=function(a){this.h=[];a||(a=x);var b=a.profile;b=b?B[b]:{};this.mode=a.mode||b.mode||this.mode||x.mode;this.threshold=a.threshold||b.threshold||this.threshold||x.threshold;this.depth=a.depth||b.depth||this.depth||x.depth;this.f=a.suggest||this.f||x.f;this.c=(b=a.encode||b.encode)&&
+u[b]||("function"===typeof b?b:this.c||!1);(b=a.matcher)&&this.addMatcher(b);if(b=a.filter){b=E[b]||b;var c=this.c,e={};if(b)for(var f=0;f<b.length;f++){var p=c?c.call(u,b[f]):b[f];e[p]=String.fromCharCode(65E3-b.length+f)}this.filter=e}if(b=a.stemmer){a=F[b]||b;b=this.c;c=[];if(a){e=0;for(var g in a)a.hasOwnProperty(g)&&(f=b?b.call(u,g):g,c[e++]=n("(?=.{"+(f.length+3)+",})"+f+"$"),c[e++]=b?b.call(u,a[g]):a[g])}this.stemmer=c}this.g=[{},{},{},{},{},{},{},{},{},{}];this.b={};this.a={};return this};
+d.prototype.encode=function(a){a&&w.length&&(a=t(a,w));a&&this.h.length&&(a=t(a,this.h));a&&this.c&&(a=this.c.call(u,a));a&&this.stemmer&&(a=t(a,this.stemmer));return a};d.prototype.addMatcher=function(a){var b=this.h,c;for(c in a)a.hasOwnProperty(c)&&(b[b.length]=n(c),b[b.length]=a[c]);return this};d.prototype.add=function(a,b,c){if("string"===typeof b&&b&&(a||0===a))if(this.a[a]&&!c)this.update(a,b);else{b=this.encode(b);if(!b.length)return this;c=this.mode;b="function"===typeof c?c(b):"ngram"===
 c?C(b):b.split(D);for(var e={_ctx:{}},f=this.threshold,p=this.depth,g=this.g,h=b.length,k=0;k<h;k++){var d=b[k];if(d){var q=d.length,n=(h-k)/h;switch(c){case "reverse":case "both":for(var m="",l=q-1;1<=l;l--)m=d[l]+m,z(g,e,m,a,(q-l)/q,n,f);case "forward":m="";for(l=0;l<q;l++)m+=d[l],z(g,e,m,a,1,n,f);break;case "full":for(l=0;l<q;l++)for(var t=(q-l)/q,r=q;r>l;r--)m=d.substring(l,r),z(g,e,m,a,t,n,f);break;default:if(l=z(g,e,d,a,1,n,f),p&&1<h&&l>=f)for(q=e._ctx[d]||(e._ctx[d]={}),d=this.b[d]||(this.b[d]=
-[{},{},{},{},{},{},{},{},{},{}]),l=k-p,r=k+p+1,0>l&&(l=0),r>h&&(r=h);l<r;l++)l!==k&&z(d,q,b[l],a,0,10-(l<k?k-l:l-k),f)}}}this.a[a]="1";this.h=!1}return this};d.prototype.update=function(a,b){this.a[a]&&b&&"string"===typeof b&&(this.remove(a),this.add(a,b,!0));return this};d.prototype.remove=function(a){if(this.a[a]){for(var b=0;10>b;b++)A(this.g[b],a);this.depth&&A(this.b,a);delete this.a[a];this.h=!1}return this};d.prototype.search=function(a,b,c){var e=[];if(a&&"object"===typeof a){c=a.callback||
-b;b=a.limit;var f=a.threshold;a=a.query}f=(f||this.threshold||0)|0;"function"===typeof b?(c=b,b=1E3):b||(b=1E3);if(c){var d=this;K(function(){c(d.search(a,b));d=null},1,"search-"+this.id);return null}if(!a||"string"!==typeof a)return e;this.h||(this.h=!0);var g=this.encode(a);if(!g.length)return e;var h=this.mode;g="function"===typeof h?h(g):"ngram"===h?C(g):g.split(D);h=g.length;var k=!0,n=[],q={};if(1<h)if(this.depth){var t=!0,m=g[0];q[m]="1"}else g.sort(H);var l;if(!t||(l=this.b)[m])for(var u=
-t?1:0;u<h;u++){var r=g[u];if(r&&!q[r]){for(var v,x=!1,w=[],z=0,A=9;A>=f;A--)if(v=(t?l[m]:this.g)[A][r])w[z++]=v,x=!0;if(x)n[n.length]=1<z?n.concat.apply([],w):w[0];else if(!this.f){k=!1;break}q[r]="1"}m=r}else k=!1;k&&(e=J(n,b,this.f));return e};d.prototype.reset=function(){this.destroy();return this.init()};d.prototype.destroy=function(){this.filter=this.stemmer=this.g=this.b=this.a=null;return this};var u={icase:function(a){return a.toLowerCase()},balance:function(){var a=[n("[-/]")," ",n("[^a-z0-9 ]"),
-"",n("\\s\\s+")," "];return function(b){b=t(b.toLowerCase(),a);for(var c="",e="",f="",d=0;d<b.length;d++){var g=b[d];if(g!==e)if(d&&"h"===g){if(f="a"===f||"e"===f||"i"===f||"o"===f||"u"===f||"y"===f,("a"===e||"e"===e||"i"===e||"o"===e||"u"===e||"y"===e)&&f||" "===e)c+=g}else c+=g;f=d===b.length-1?"":b[d+1];e=g}return c}}()},K=null;return d}(!1),this);
+[{},{},{},{},{},{},{},{},{},{}]),l=k-p,r=k+p+1,0>l&&(l=0),r>h&&(r=h);l<r;l++)l!==k&&z(d,q,b[l],a,0,10-(l<k?k-l:l-k),f)}}}this.a[a]="1"}return this};d.prototype.update=function(a,b){this.a[a]&&b&&"string"===typeof b&&(this.remove(a),this.add(a,b,!0));return this};d.prototype.remove=function(a){if(this.a[a]){for(var b=0;10>b;b++)A(this.g[b],a);this.depth&&A(this.b,a);delete this.a[a]}return this};d.prototype.search=function(a,b,c){var e=[];if(a&&"object"===typeof a){c=a.callback||b;b=a.limit;var f=
+a.threshold;a=a.query}f=(f||this.threshold||0)|0;"function"===typeof b?(c=b,b=1E3):b||(b=1E3);if(c){var d=this;K(function(){c(d.search(a,b));d=null},1,"search-"+this.id);return null}if(!a||"string"!==typeof a)return e;var g=this.encode(a);if(!g.length)return e;var h=this.mode;g="function"===typeof h?h(g):"ngram"===h?C(g):g.split(D);h=g.length;var k=!0,n=[],q={};if(1<h)if(this.depth){var t=!0,m=g[0];q[m]="1"}else g.sort(H);var l;if(!t||(l=this.b)[m])for(var u=t?1:0;u<h;u++){var r=g[u];if(r&&!q[r]){for(var v,
+x=!1,w=[],z=0,A=9;A>=f;A--)if(v=(t?l[m]:this.g)[A][r])w[z++]=v,x=!0;if(x)n[n.length]=1<z?n.concat.apply([],w):w[0];else if(!this.f){k=!1;break}q[r]="1"}m=r}else k=!1;k&&(e=J(n,b,this.f));return e};d.prototype.reset=function(){this.destroy();return this.init()};d.prototype.destroy=function(){this.filter=this.stemmer=this.g=this.b=this.a=null;return this};var u={icase:function(a){return a.toLowerCase()},balance:function(){var a=[n("[-/]")," ",n("[^a-z0-9 ]"),"",n("\\s\\s+")," "];return function(b){b=
+t(b.toLowerCase(),a);for(var c="",e="",f="",d=0;d<b.length;d++){var g=b[d];if(g!==e)if(d&&"h"===g){if(f="a"===f||"e"===f||"i"===f||"o"===f||"u"===f||"y"===f,("a"===e||"e"===e||"i"===e||"o"===e||"u"===e||"y"===e)&&f||" "===e)c+=g}else c+=g;f=d===b.length-1?"":b[d+1];e=g}return c}}()},K=null;return d}(!1),this);
diff --git a/flexsearch.min.js b/flexsearch.min.js
index 9de2464..c115519 100644
--- a/flexsearch.min.js
+++ b/flexsearch.min.js
@@ -4,27 +4,27 @@
  Released under the Apache 2.0 Licence
  https://github.com/nextapps-de/flexsearch
 */
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diff --git a/package.json b/package.json
index 9c092e1..c714a8a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "flexsearch",
-  "version": "0.2.63",
+  "version": "0.2.65",
   "description": "Next-Generation full text search library with zero dependencies.",
   "homepage": "https://github.com/nextapps-de/flexsearch/",
   "author": "Thomas Wilkerling",
diff --git a/test/test.js b/test/test.js
index 48ef70e..0bf17f9 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1126,7 +1126,7 @@ if(env !== 'light'){
 
                 'id',
                 'chars',
-                'status',
+                //'status',
                 'cache',
                 'items',
                 'matcher',