Engine performance improvement

[shunguoy]

analyze the rule engine to improve performance.
also from Tom: Some good pages for performance analysis. I think these are large enough that we'll have trouble with them no matter what, but, would be good if we can find some optimizations. For instance, we may need to be smarter with our contrast calculations - find some way to carry some of the expensive calculations between nodes (though not sure how we'd do that offhand).

• Performance improvement for color contrast calculation  #1976

https://ibm-studios.slack.com/archives/C036P1CTN/p1723020298582739

Epic Details

• Hill: what does the user need – include some sort of WOW element
• Playback Demonstration: what will you be able to show at the end of the release / point release to demonstrate how you accomplished your user story. If possible, list what you target to demonstrate for each sprint
• Metric: how can we measure the impact of this change
• Comms: when completed who should you communicate this change to, what will you tell them (concisely), and where?

What project/section is the Epic for?

• toolkit
• acs
• a11y central
• acr
• requirements
• special airplane
• checker
• carbon
• standards
• other

Definition of Done

• Results are added to the Release Mural with a description of what was accomplished, KPIs, etc
• All content has been reviewed for grammar, spelling, style and technical accuracy
• All code committed to main branch
• All unit tests pass (including accessibility)
• Demo works in staging environment
• At least one performance metric / monitor constructed