Performance problem with highlighting via markText


We use markText to interactively highlight multiple lines of SQL code. See demo here –

You can notice a small delay when you move the cursor over multiple columns. With larger chunk of SQL queries the delay arises to multiple seconds and our app becomes barely usable.

Is there a way how we can improve performance? We are fine with making a donation if the Code Mirror performance is improved significantly.



Are you wrapping your calls to markText in an operation yet?


Thanks! We have noticed the initial performance boost. We are testing this further.


Ah-ha! Thanks Marijn :slight_smile: