I assume you mean worker process, otherwise you’d by using 70 Gb of RAM with the 7 threads you are using.
Identical as in the same certificates/certificate-list are used for all of those?
Then I’d suggest to unify them using a single bind statement instead, that should improve the situation by a factor of 35.
I believe 2.2-dev can do some deduplication here, but I’m not sure if it covers all cases and if it also improves reload time (or just memory consumption).