What happened with IDE code editor (10.3.2)

1) Its becomes veeeeery slow on usual files, which was previously ok. Especially scrolling, if someone have a good mouse, like Logitech with "free wheel" it just unacceptable. Much slower than in previous IDE versions.

2) Also, which is however less important, non-usual Unicode strings like: //1= 2=︎ 3= 4= 5= 6=︎‍ will kill the IDE if someone will try to select the line, especially in block selection mode (Alt+Shift+Arrow).