Best way to optimize comparing 2 pages

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Hello, I have a comparison website. Each page has multiple fields (repeater, date, integer, text)

The purpose of site is to select 2 products and compare them

My problem is high load. There are several millions of possible comparisons. I use default Cache option. But for almost all comparisons there are no cached version. And generating cache for them is useless because many of them are requested rare

I think loading 2 pages with all their fields are creating high load

How can I optimize it? Can I cache all pages for individual products (less than 5000)? And when comparison runs it will use cached data instead of requesting all fields?

Whats the best way to do it?