Version of emscripten/emsdk: 3.1.74
tbb*: 2022.1.0
Multithread build.

We use tbb. We create a pool of workers. We submit the first task and get the result in 0.7 s (multithreading works)
Then all workers die and the next task runs on only one worker. 1.5 s (multithreading does not work)

Demo project
https://github.com/Liahimz/MinimalWasm