Forms :: Access 2003 / Dynamic Search Form Very Slow?

I am using John Big Bootys Dynamic Search Form (built in Access 2003) as it totally met my search requirements, however when typing anything into the search box it is realy slow, taking several seconds for each letter to show in the box.

This has always been a problem now and again, however some of us have upgraded to Office 2010, (although still using the 2003 built Db as we won't move to a 2010 version Db untill March next year) and now the problem is even worse that ever. Everything else seems to work really well except for this search function, however it is the search function that is used more that anything else.