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Hello.
Are there any abnormalities in Lightsail's CPU usage and CPU burst capacity metrics?
Especially since the Lightsail you're using seems to be on a smaller plan, it should have less CPU burst capacity and lower baseline throughput, so it's possible that you'll quickly use up your CPU burst capacity as CPU usage increases.
If the CPU burst capacity is used up, the performance will drop to the baseline throughput, which will affect the display of the website.
https://docs.aws.amazon.com/lightsail/latest/userguide/viewing-instance-burst-capacity.html
By the way, the Lightsail instance plan you are using will start consuming CPU burst capacity when the CPU usage rate exceeds 5%.
https://docs.aws.amazon.com/lightsail/latest/userguide/baseline-cpu-performance.html
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I am not really able to read this properly, but it is the max pick I see is 78% for an instance I assume.
An instance's CPU usage of 78% is above the baseline throughput and may be consuming CPU burst capacity. Also, if Lightsail is using that much CPU usage, it may be due to insufficient specifications, so I think it would be a good idea to consider changing to a Lightsail instance plan with higher specifications. https://repost.aws/knowledge-center/change-lightsail-plan