Calendar widget latency

I have a calendar widget which accepts list of objects and renders it to the client. In my case, the current size of the list is 3700 (which will be increasing periodically) and the calendar takes more than 25 – 30 seconds to render. I tried this method -> but the calendar wasn’t rendering till the loop is finished. Please let me know of any other method that I could try to solve this latency. Thank you.
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