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Memory consuming

I finished developing my web app using Dash, and I tried deploy the app to Heroku server. Unfortunately, I encountered with memory issues. I tried profile my app’s memory (using memory-profiler), and I saw that the used memory going up to 275MB right when I launch the app from the command line.

Do you have any idea why so much memory used when I start the app (the only command in the main function is: app.run_server), and how can I optimize the memory consuming?