Using camera will not free the ram used after clearing/exiting app

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1

2017-05-27 01:59

Anyone faced this problem? The problem I am facing right now is everytime I use camera app, stock camera app, google camera, etc., it will use some ram (of course) but after exiting the camera app, the ram seems not cleared automatically. I understand free ram is wasted ram, but the problem I encountered is the ram used by the camera is still there without any app using it, makes the multitasking harder. I put screenshot here to make it easier to understand:

1) my free ram about half after restart. I opened all kind of apps (not camera app) and clearing the memory, it reset back to half free memory.

2) when using camera app, the ram usage is staying there without freeing the ram used even after cleared all app in task manager. if I only take picture, the ram taken is not that high, but from the image i uploaded, I recorded 4k video and look how much ram is taken:  The second screenshot is without using any camera app: after opening many app and clearing the task manager:  The only solution I found right now is by restarting the device to reset the ram usage and avoid using the camera app if I want to do heavy multitasking.
3) I found this problem on global and china rom, tried flyme 4/5/6 (currently flyme 6 latest chinese beta), but the problem is still there. Anyone facing this problem?