Slow scrolling in perl files about context.vim HOT 5 OPEN

I've profiled the slow scrolling in /usr/share/vim/vim82/doc/vim2html.pl

context.log

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Hmm, I've added let g:context_filetype_blacklist = ['perl'] to my ~/.virmc but scrolling in perl files is still slow.
But when the context.vim plugin is not loaded at all scrolling is back to normal.

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I experience something similar with python. It also still happens when context is disabled with :ContextToggle.

Even relatively small python files (63 lines) are dropping a lot of frames when scrolling through them where larger c++ files are just fine. Large python files are extremely slow.

Perhaps context should not update on cursor move or scroll until the cursor stops for some amount of time, say a few hundred milliseconds?

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I have disabled the cursormove and winscrolled events and rely on cursorhold for now as a workaround.

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Related to #102

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