Problem with zoom in, zoom out, right click... in big layouts

Hi,

I am wondering, if you have problems with usage of this great product DraftSight on big layouts when you use functions like zoom in, right click...

I tried on Win XP, Win Vista.Multiple veersions of DraftSign. tried new grafhic drivers. No better result.

Any more sugestions please?

Thanks.

With regards, ViljemT.