Zoho Writer very slow

I really like your service but the overall response is slow.

Document scrolling speed is fine.

However, doing a search in a large document (3.3 MB before import, all text with minor formatting, no images) is extremely slow and usually takes over 30 seconds (compared to instantaneous in Word). Doing typical editing is extremely slow.

I'm using IE7 under XP.

Please convince me that I should stay with Zoho.

Thanks,
Chi-Kai