Improve startup performance by using promise.all when processing rooms from sync
#5095
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When EW starts, it first processes a huge sync response from the sync accumulator. Testing on my account, a large chunk of the work is just processing the joined rooms. We can improve the performance of this code if we switch to
promise.all.Shaves off more than 20 seconds from startup time on my account (30-35 seconds vs 10 seconds).