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Performance problem with psc-ide #2064

Description

@kika

MacMini 2012 i7 16GB 1.2TB Fusion drive, OS X 10.11.4 El Capitan.

MacVim takes 10-20 seconds when closing/quitting the purescript source file with psc-ide integration installed, even if no changes were introduced.
When this happens one can notice ReportCrash process hanging for a few minutes with the following in the system.log:

Apr 29 03:39:30 kika-mini com.apple.xpc.launchd[1] (com.apple.ReportCrash.Root[8423]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash.DirectoryService
Apr 29 03:39:31 kika-mini ReportCrash[8423]: Invoking spindump for pid=8385 wakeups_rate=185 duration=244 because of excessive wakeups

PID 8385 is the pid of the psc-ide-server process.
Diagnostic report from ReportCrash: https://gist.github.com/kika/b358b53a0411e79d45ead38870052c34

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