@Ihor_Taranenko - The caret placement should be resolved in the next beta if you're hitting the same issue as reported here. That issue specifically depends on how the caret was moved to the first character on the line. If the caret is moved by mouse click or arrow keys without modifiers like Ctrl then the problem does not exist, but if you use other means, e.g. Home, then the problem exists.
The slowdown I'm still investigating. I believe it has to do with the code that handles matching brace highlighting.