Web app runs super slow after AWSSupport-ResetAccess

Here's what happened:

1. I spun up an EC2 instance
2. I successfully installed Ghost on it (a self-hosted blogging platform)
3. I lost my *.pem private key that gives me access to the EC2 intance
4. I ran the AWSSupport-ResetAccess automation service to recover the password
5. I successfully recovered the password

However, if I open any page on my blog now, it takes more than 10 seconds to load. In my admin dashboard, I can't make any edit - it returns server errors every time I hit save.

I know that there can be many reasons for the cause of this lag, but I thought to ask this question in case this is a common problem? Is the AWS System Manager known to cause this lag to EC2 instances after an automation flow is executed?

I'm running a t2.micro Ubuntu 18.04 machine in the "eu-west-2" region.