CPU running high on opening app

Question

Hi. I'm a new user of Sophos for Mac.

I recently noticed that when I try to open a third party application called Miro on my Mac, Sophos Antivirus runs the CPU up to 100% and often causes Miro to freeze, and fail to open. The only fix I have been able to come up with is Force-Quiting "Antivirus" from the activity monitor. This lets Miro open, and everything goes back to normal. I have tried to exclude Miro from Sophos's virus scan, but this does not work.

I am running Sophos Anti Virus 7.3.2C on my first gen MacBook with Mac OS X Snow Leopard 10.6.8

If I can be more clear, let me know, otherwise, thanks for any solutions anyone can come up with!!

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Agile · Accepted Answer

The issue is more likely to be with some of Miro's features, such as the built-in bittorrent server, than with the main app. When Miro launches, it actually reads a lot of files and starts a number of sub-processes. So when it starts up, the on-access scanner sees requested access to all your torrent files, configuration files, scheduling daemons and cache files, and attempts to scan them all prior to letting Miro have access to them. Needless to say, this is a large set of data, and the files are being continually opened/closed. Miro doesn't handle this very well, and waits for the result of the actions it started to complete before it will finish loading (hence the unresponsive interface while Antivirus races to scan all the items and allow Miro to use them).

Excluding /Users/<yourusername>/Movies/Miro/ from your on-access scans should significantly decrease resource usage suring Miro startup.