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My single page app was running fine until today, and it's gotten extremely slow (initial data load went from 2s to 20-30s) even though I didn't change any code (although since then, I've uploaded some lines of print code to see which part is causing the slowdown). Is there any maintenance or migration on-going?

If it helps, from my debugging code, the main bottleneck seems to be from loading some data from our postgres database, but like mentioned above, we've never experienced this level of slowness before.

We are not doing any maintenance and there is no increase in load on the postgres servers. If you are selecting more or selecting from a poorly indexed table that contains more data, then the queries will be slower.