Game does try to switch to Medium quality if frame rate is slow early on. Those complaining about lag should go to Pause Menu (Escape key) and choose Medium quality manually. I also found out that game runs smoother in FireFox or Chrome compared to IE.
Thanks for feedback.
Please try to adopt game recognized shapes for Mouse Drawing (See Hints in game) . Game can't possibly recognize all writing styles but if you stick close to what game offers it works very well. Thanks.