Rt-Ax86u RAM won't release after use of USB storage?

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New Around Here
My router is RT-AX86u (fw 386), lately I just plug a USB 3.0 to use as a storage device on my LAN network.
But I notice that if I don't download from the usb, the RAM will always stay around 550/1024. But if I start to download from the USB, RAM usage will pump up to 990/1024 and will leave around 30mb free RAM.
Problem is: after the download is complete, RAM usage will also stay around 990/1024 instead of lowering down. Is this a normal behavior? Or RAM should be released?
The RAM will only go back to ~550/1024 after reboot of router. Hope someone can clarify this.
Thanks in advance!


Part of the Furniture
RAM will be used as needed. And released if needed.

Unless you're having issues, there is no need to worry about it.

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