UV3 editor and required PC speed

Hi folks

I'm using UV3 IDE (V3.33) on a HP Omnibook with Pentium III 850MHz.

While the previous version has had any problem inside the editor this one is unusable.
Deleting characters in a line has no affect, at first.
So pressing the DEL key again ... nothing.
And a third time again ... no action.

5 to 30 seconds later screen updates the line, ups. 2 DEL hits to many.

It seems to be unpossible to run UV3 at this old PC.
UV2 hasen't this behaviour.

Is this a UV3 typical problem to makes problems at PCs with similar speed?

Or can I work around it by disabling few settings in the editor?

hopeful - Günter