Yep, I used to have that as well. Not anymore, since when you're on 64 bit with greater memory allocation it's pretty much sufficient. It does slow down on hectic trading... so when Europe or US opens you will notice a difference... but that just the amount of data coming through. Anyway, go for the switch to 64 bit with ActiveX and you will be a happy camper!
just an update. Moved everything to either RTD or ActiveX (from DDE) and am now using TWS 64 bit. Worked really well last week. thanks for the input