Many companies use ATS with AI technology to pre-screen applicants' resumes before it even makes it to a human.
I would never suggest that anybody stay at a job where they aren't happy. However, I recommend speaking with your employer before quitting your new job.
I understand that you can get down on yourself when things aren't moving as quickly as you need, but stick with it because that perfect job is out there.
A company wouldn't waste time going through the process if it didn't find it valuable. Being honest during your exit interview will help the organization address inefficiencies and any problems that senior management needs to notice.
You always want to be able to show your employer what you have been working on. Even if it's slow, you can still be productive.
Compensation is not about how hard somebody works. Employers compensate employees based on their positive contributions to the company and what they achieve for the organization.
Allow time for your relationship to develop. Just because things are different, it doesn't mean it's worse. It's different but also creates new opportunities
Highlighting new skills, you developed during your time away from work can help you prove that you are the best person for the job regardless of the time you had off.