I'm using Flint particle engine by StephenL and noticed one issue.
I have 2 frames: main menu and level. Flint object is placed only in level frame. At the start particles are drawn very quickly (50FPS). But after over 20 game restarts FPS drops below 20FPS.
How to repeat process:
1. Go to http://tecbug.pl/pub/flinttest6.html
2. press space to go to level
3. click mouse couple of times
4. when ready press space to return to main menu
5. repeat 2. and 4. about 20-30 times
6. go to level and click mouse
Tried to "stop emmiter" when quitting level, but it didn't help.