I fell for that one darned library that tries to access a sqlite db synchronously, and now my project is constantly freezing up.
We’re talking like ~15 second latencies though. That’s abnormal.
Well, use rewind, it should inside, or next to tools. Go to before you installed it and you should be good. 
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I made a monitoring page for this: https://trusted-seemly-ceres.glitch.me/
You’ll see boxes representing the latency over time. Most recent measurements are on top. Occasionally the latencies are extremely high, so it’s plotted on a log scale.
This tests the latency on the projects drive with this command:
dd if=/dev/urandom of=.data/scratch.dat bs=32 count=1 oflag=sync
This makes a small write and waits for it to complete. The monitor runs this periodically and times how long this operation takes.
I’m not running this as an always-on project. I only run it when I’m using Glitch. Different runs are separated by the word “gap.”
@glitch_support, could you please add a projects disk latency monitor to status.glitch.com
Very weird through, anyway did you try rewinding your project?
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Nah. The author of that synchronous library actually makes some compelling points about how it’s really fighting an uphill battle to try to make concurrent async requests to sqlite. Although I do wonder if there could be an async but still serialized library, where there’s a single worker thread doing the sqlite work.
Plus, even if I did rewrite the project to save data asynchronously (incidentally I can’t actually rewind to a different version, because already migrated the user data), it would still be too worrying to leave these writes up in the air for >5 minutes. The latency is literally high enough that Glitch could put the project to sleep while we’re waiting for a write to come back. My app will have no idea if stuff is being saved or not. Right now I think it’s better to be transparent in this way and make it very evident that the app is on fire, and their stuff is not being saved.
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Maybe there is a issue at glitch’s end. Or something is very wrong.
Maybe use an other library ?
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It’s okay, the monitoring is done without that library in question. It’s meant to be a metric independent of library choice.
dd: error writing '.data/scratch.dat': Input/output error
oh no, now it fails outright sometimes