UI is unusably slow with 100+ cards

[uhppoted]

Ref. https://github.com/uhppoted/uhppoted-httpd/discussions/34#discussioncomment-10423271

With 100+ cards the user interface is sluggish to the point of being unusable:

• [x] Cache element queries
• [x] Loading windmill
• [ ] Optimise rollback-all
• [ ] Optimised commit-all
• [ ] Incremental/paged load
• [x] nightly builds

[twystd]

Baseline performance with 200 cards:

[twystd]

With basic 'query' cache:

[twystd]

With cached query and query modified:

[twystd]

rollback-all:

[twystd]

rollback-all (with caching):

[twystd]

rollback-all (modified only):