Applied for a job I was well qualified for.

3-4 weeks later, I received a call from the recruiter.

They seemed interested and set up the first 30-minute tech interview.

It went well, and they informed me as such, wanting to continue.

Contact then stopped completely for a week.

I sent multiple emails following up.

Finally, I heard back a week later (2 weeks after getting positive feedback) and they wanted to move forward.

Come to find out, they just wanted to promote internally, and the position I applied for was closed, but they had another one they wanted me for (the same position but a different opening number).

I then did the next 4-hour interview block with 3 manager interviews, all asking the exact same behavior/situation questions.

Had one tech interview where the interviewer just fired questions non-stop for an hour about React and Java, which I had plenty of experience to fall back on.

I felt I did pretty well.

To no one's surprise, I didn't hear back from the recruiter at all afterwards.

I was done trying to work with the recruiter at this point, and I didn't bother to follow up since I was juggling between 2 other offers that were about 20% higher than this position shows on Glassdoor.

I still would have considered the job due to benefits, but that was never an option.

How would you troubleshoot slowness in an application?

How would improve page load speeds?