Describe the bug
Holding onto the enter key for ~30 seconds during the game causes a drastic drop in framerate.

To Reproduce
Steps to reproduce the behavior:

1. Start game
2. Hold Enter until lag becomes visible

Expected behavior
No slowdown when you hold Enter

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Chrome

Additional context
It appears to be a memory leak and/or DOM leak, but I lack the expertise to figure out the issue.

Is your feature request related to a problem? Please describe.
A reddit user contacted me asking me to add a 7-piece bag option (which corresponds to classic Tetris).

Describe the solution you'd like
A way of being able to adjust the # of pieces in a bag. I prefer this solution over just adding a 7-bag option, since people in the Tetris community tend to be very particular about their own setup - i.e. more customization is better.

Describe alternatives you've considered
N/A

Additional context
I was going to do this myself but I'm a bit busy atm. I can do it if you want me to, but it will probably be a couple of weeks before I look at it. Let me know if you have time to take it, otherwise I'll do it.

Describe the bug
Timer appears slightly slower on Firefox when compared to Chrome