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It depends on the instance. If you use up the burst capacity, you will notice. The very bottom end only allows about 5% usage before the throttling kicks in. There's a chart here:

https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amaz...

Hmm, interesting. I unfortunately don't have the metrics anymore since this project is long dead.

But I do remember on another host (I tried a different one between linode and light sail) that I actually got an email that I was using too much CPU and was shut down.

So I do remember using a lot of CPU, but I don't know where that percent was.

Lightsail are among the worst when it comes to actual benchmarks. Though you might not notice if your apps aren't very resource demanding.

Their fastest instance type is still in the bottom ~15% of this list for example: https://www.vpsbenchmarks.com/screener

Doesn't LightSail rely on t-family (burstable) instances? If so, that's probably because your projects' regular sustained usage do not go above the minimum threshold (which is fairly low).