I had a problem with FL9, and I found a workaround.

[jobromedia]

As I PM'd you guys about I reported a bug in SynthMaster 2 that it had latency issues. I discovered here tonight that it is a very simple cure for that behavior in FL Studio 9.

1. Enter the plugin preferences (the button in the title bar of the plugin.
2. Under processing you select Use fixed size buffer.

This solves the problem with latency issues in FL Studio 9, and most likely in earlier versions allthough that setting is in a somewhat different place.

[Cyrosis]

Fixed buffer adds it's own latency, although it's a relatively small amount, and likely better than what you were experiencing before.