Wide tables cause bad performance

[GraysonGao]

Vim version: Windows GVim 8.1.
When there's a wide table in markdown file, performance slows down badly. for example:

head1	head2	head3
text1	text2	test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test
text1	text2	test test test test test test test test test test test test test test test test test test test test test test
text1	text2	test test test test test test test test test test test test test test test test test test test test test test

When I press h,j,k,l quickly or hold these keys, the cursor will disappear. When typing quickly, editor slows down.

[antenore]

I have the same issue, if I can provide some help in debugging let me know.

[antenore]

Ah, this is duplicate of #34