Page load speeds and performance issues (main issue)

[zachgoll]

This is the parent issue for addressing all performance related issues with the "V1" product. We will take a first pass to get every page to a reasonable state and then further optimize on a case by case basis thereafter.

Noted areas that will need performance improvements:

• /transactions page - on a good network, takes upwards of ~5s to fully load (FCP is fast, but LCP is very slow, likely due to loading Synth logos for each transaction)
• Dashboard, specifically when user has multiple currencies that need currency conversion (noted in Bug: Changing timezone to Asia/Krasnoyarsk causes page loads to be over 15 seconds #1588 and Performance issues with multi-currency setup #1530)
• Transfer matching-modal form submission (takes several seconds to submit)
• All modal forms need a "submitting" spinner
• EnrichDataJob causes long syncs and takes queue concurrency slots (should be moved to another queue as it is not mission-critical)