/tmp is a RAM-filesystem in Fedora configured to grand a maximum of half or RAM size.
If you want to save heaps of data for some time, don't do this in /tmp, use /locData instead.
So /tmp will be very fast, but it can not shrink it will only grow to its maximum size and steal you valuable RAM.

All your data in /tmp will be lost after a reboot, because /tmp is only a RAM-filesystem.
And because of (1.) to reduce the size of /tmp, all files older (last used, read or modified) than 10 days will be deleted by a system service.