OK. Please reduce the problem down to a single app, like just Firefox. Now, 
please let us know:
  1. The version of Firefox; and
  2. What web page(s) cause the biggest problem.

I think my list of planned fixes for Ubuntu 18.10 [1] will be the best
avenue for helping you because the Celeron 847 has a passmark [2] of
936, and I estimate gnome-shell presently requires a CPU with passmark
around 5000 or more to run smoothly. Obviously we need to get that
number down a lot by optimizing gnome-shell in future...

[1] https://trello.com/c/pe5mRmx7
[2] https://www.cpubenchmark.net/cpu_list.php

** Tags added: performance

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