Photoshop CS4 does not release RAM

I run Photoshop CS4 on a Windows PC with 4GB. Even though I frequently
"purge", Photoshop does not seem to be releasing RAM even when all files
have been closed, often holding on to some 2GB RAM. Only when I terminate
Photoshop, the RAM it grabbed is released. This means I would have to exit
and relaunch Photoshop many times a day.
Any suggestions?

>the RAM is reused
Yes but since PS claims the RAM (for very good reasons, I agree) it seems only available to PS itself, so sometimes a plug-in (like PTlens) reports that it doesn't get the RAM it needs. Only one normal camera file is open.
After relaunching PS it works.
Sometimes RAM actually seems to get released within a session, why that happens, I don't know.
I have no problem with PS working this way. I appreciate PS wants RAM that's contiguous and thus doesn't want the O/S to hand it out, but some parts of the workflow call for external plug-ins to join in.
Rob

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