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:

• Dashboard, specifically when user has multiple currencies that need currency conversion (noted in #1588 and #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)
• Budgeting page is slow when user has large number of transactions