Handle resource changes when the resources is already evicted from cache

Also fix a logical flaw in the cache resizer that made it too aggressive. After this I haven't been able to reproduce #11988, but I need to look closer.

Closes #11973
Updates #11988

config/allconfig/configlanguage.go

@@ -73,6 +73,10 @@ func (c ConfigLanguage) IsMultihost() bool {
 	return c.m.IsMultihost
 }
 
+func (c ConfigLanguage) FastRenderMode() bool {
+	return c.config.Internal.FastRenderMode
+}
+
 func (c ConfigLanguage) IsMultiLingual() bool {
 	return len(c.m.Languages) > 1
 }