Oh from 3-4 there is a backup going on 
Access to the web page was denied
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Error 139 (net::ERR_TEMPORARILY_THROTTLED): Requests to the server have been temporarily throttled.
A leak - it got up to 5gb usage... then locked.Memory leak or is it running close to capacity?
That day that setting was changed it was perfect for me....
Really? Ok - I'll set it back then - from the amount of processes spawning, it didn't seem like it had worked - but perhaps that is a red herring. I might also set a limit on them too - although I'm unsure what happens when the limit is reached.