> But Komodo's editor was for my taste too slow.

The editor is fast but some features slow it down. Turn off all "code intelligence" autocomplete items for a nice speedup.

> imagine a spellchecker running perl -c in the 
> background. eg if a my is forgotten the line 
> will be marked after a second.

Excess syntax checking is slow too. Adjust that interval for more than 1 second between checks.