Poor performance of multi-party post-election decryption for 3000+ selections

[dsernst]

Need better stress testing for post-election multi-party stuff to test how well it runs for large numbers of cipher texts

[dsernst]

Possible improvements:

• [ ] Don't store big data dumps in localstorage that don't need to go into local storage. (every intermediate shuffle, every downloaded partial proof)
• [ ] Cache proof verifications after run, so every refresh doesn't need to re-run them
• [ ] Split up work-loads into smaller piecemeal parts
• [ ] Run CPU heavy workloads in separate WebWorker thread, so it doesn't lock browser