I've had a similar issue where random freezing will occur. It usually lasts from half a second to 3 or 4 seconds. Doesn't sound like a long time but it can be an eternity in game. I always play the game on high settings, but this shouldn't be a problem with my computer. It was never an issue before WFA.
Hopefully it is just a fixable memory leak issue and relic will be able to patch it quickly.
That isn't the memory leak. It's been in the game since day 0 for me, and I've never managed to fix it. I suppose I haven't tried, but there isn't any identifiable cause. Every time I list my system specs they say "your CPU is overclocked, disable that". It's a stable overclock that is necessary as I have a first generation i7 (especially for CPU intensive games like COH2).
Graphic options have nothing to do with this - the same graphics setting as pre-WA is performing worse now WA is here, and there is not an explaination.
There a source on the memory leak post?