How can I make the local decryption so fast that the user don't even understand we're decrypting everything locally? as like in Proton mail?

Hi, I was working on extension that has an end-to-end encrypted sync, and when user first time install the extension on a browser where it needs to download all the data (can be a few hundreds or thousands), then it was taking a huge amount of time in the first place then I spend some time researching and found that using workers with a worker pool is the best thing I can do to improve the performance, now it's significantly faster as compared to previous encryption/decryption approach where everything was inside the main thread and being done one by one. but, it's still not like the protonmail inbox where I never see any decryption progress when I login and open the inbox, so, how does that work and how can I make my tool work like that? and as I can't explicitly set that how many workers will actually work in parallel during runtime, as it's up-to the browser based on the available resource, so, is there any other way to get the most out of the workers to make the encryption decryption even faster? btw, I'm currently using the same salt per batch of 100 items, salt, iv, derived keys are generated once and passed to those workers for batches, so, workers are not doing same thing again for common tasks, decreased iteration from 600K to 400K for faster performance. so, if anyone can help me understanding how these works, and how can I make it even better, I'll really appreciate that :) submitted by /u/nhrtrix [link] [留言]