Some more activity graph drawing perf improvements

[mstange]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.42%. Comparing base (23fea36) to head (961c48b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5886   +/-   ##
=======================================
  Coverage   85.42%   85.42%           
=======================================
  Files         321      321           
  Lines       32073    32065    -8     
  Branches     8821     8814    -7     
=======================================
- Hits        27398    27393    -5     
+ Misses       4244     4241    -3     
  Partials      431      431           

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