Onyx - excessive calls to `getCachedCollection` in `keyChanged`

[kacper-mikolajczak]

Problem

One of the Jason's traces shows weak performance of Onyx keyChanged function, caused partially by excessive calls to getCachedCollection.

Sample keyChanged call

Summarized impact of getCachedCollection

[melvin-bot]

@kacper-mikolajczak, this Monthly task hasn't been acted upon in 6 weeks; closing.

If you disagree, feel encouraged to reopen it -- but pick your least important issue to close instead.