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I have 2.5gb RAM dedicated to AE, and I do not render multiple frames simultaneously.
But you may still be using a temporal effect or feature that accumulates buffers over time or large blurs and glows as wel las 3D features liek shadow maps. MP is a not so minor source of trouble, but not the only one. Anyway, without seeing your project, this will be shooting in the dark. I recommend you look whether you use such stuff like Timewarp, CC Force Motionblur, AE's own motion blur, shadow maps set to comp size when they needn't and so on. furthermore, you may consider substituting effects for others to achieve the same result. E.g. Box Blur is much more memory friendly than Gaussian Blur and there is even more potential if you use comemrcial plug-ins that are better optimized...
I wasn't refering to any project in particular, but most things I make in AE do use a lot of those memory-hungry effects. I'm well aware that I should be using a more powerful machine for these tasks, and that such issues are to be expected. However I would never consider compromising the quality of my compositions in order to speed things up, so if I have to do things this way then I can live with that. I was only wondering if there was perhaps a quicker way of restoring my RAM (I know very little about these things) without having to restart my laptop every hundred frames.
You might need to change the default setting for purge frames. Start by holding down the shift key and clicking on Preferences>General.
At the bottom of the list of options you'll see Secret. Go there and change the default setting for Purge Frames during render to something like 20 then try again. If that doesn't fix the problem check Disable Layer Cache.