Input doesn't process properly at high speed

[PSCoder10462]

Once speed increases above threshold, game stops processing inputs and blocks are almost hardfalling.
The tetromino can only be manipulated for a small instance when it is just displayed at the top of canvas.
Please fix it.

[Arsenic-ATG]

Update : after 51d882a
The maximum threshold speed has been reduced while speed at which the game progresses has also been decreased, making the game much more playable and fair.

That being said, the game needs a much faster way to read input from the user thus I am still keeping this issue open.