Suggested AWS vCPU's and Memory?

I am running on AWS EC2 Debian with 2 vCPU’s (virtual CPU’s) and 1GB of memory.

With 500 Targets and a few dozen entries thus far, I typically see “Server response time: 0.02 seconds.”. Email(Google Workspace) is, of course, slower, " Server response time: 3.33 seconds.".

I am not sure what the speed of the AWS <-> Google link is, however, I imagine it is very fast.

Has anyone tried more CPU’s and or memory with a noticeable improvement, especially for email?