That depends on what you're paying for. If you're using Lightsail or one of the t-series EC2 instances you'll definitely get throttled as you don't get dedicate

That depends on what you're paying for. If you're using Lightsail or one of the t-series EC2 instances you'll definitely get throttled as you don't get dedicated hardware. All other EC2 instance types give you dedicated hardware, on the Intel instances you get one hardware thread per vCPU and on the ARM instances you get a physical core. Those instance types don't throttle.