My Ubuntu 18.04 file manager seemed to be working overtime since fresh install a short while ago. It takes a long time before "settling down" when large-ish files are opened.
When working with a large number of photos, it freezes after a while, holds the freeze for a few seconds, then seems to open up but re-freezes before finally allowing me in again. This gets worse as I continue to work with the files, but if I restart the file manager it runs well again but only for a while, then the problem resumes.
I have changed the file manager from Nautilus to Nemo, the same problem in both.
I tried this fix: https://medium.com/@gspasov2/how-to-...s-52bb75d55c70
but the system responds with “unable to locate package”
I have: Linux jan-ESPRIMO-E5731 5.3.0–51-generic #44~18.04.2-Ubuntu SMP Thu Apr 23 14:27:18 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
I have 8 GB RAM and a Pentium(R) Dual-Core CPU E5700 @ 3.00GHz × 2 processor. Graphics is Intel® Q45/Q43, SSD hard drive less than 50% full.
Suggestions will be welcomed.

Does the delay disappear if switching to list view? (I suppose you use some thumbnail mode normally) If so, your habits maybe demand 16G RAM to generate/administer such a bunch of thumbnails? And maybe also double size SSD?

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