For /tmp I would definitely use tmpfs.
It's as simple as adding an entry to the fstab

tmpfs /tmp tmpfs nodev,nosuid,size=2G 0 0

In this example, your /tmp will be 2 gigabytes big, but tmpfs will keep
your /tmp in RAM, while not cutting off the entire 2GB of your system's
RAM. It will only use as much as it needs.

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~ parazyd
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