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Hi. I am also having problems with slow order submitting.
My server is fast enough (2x quad core xeon + 8GB ram + SAS HDD), the rest of the site is running very quick.
When I hit the submit order button it sometimes takes up to one minute to submit order.
It is very strange that if I refresh cache, the order is submitted very quick. (within 1-2s). But after some time it gets slower and slower.