Second round of review is taking longer than the first one Few months ago, I have submitted my manuscript to a very reputed journal. After 80 days, I got the first decision (major revision) with very simple comments from 3 reviewers. The status in the last 15 days was "Awaiting Editors Decision".

After submitting the revised version, I am still waiting for almost 3 months with one status "In peer review". Up to my knowledge, the second round should be shorter than the first one. In addition, I checked published papers in the same journal, where the second round was very short in all of them.

I am wondering, what is heppening with my submission.
Lots of things can happen to delay the review process. For instance, heavy teaching commitments in the winter can slow things down, although they should now be over. Also, there really should be no correlation between the reviewing times for an original submission and a resubmit after major revision. The referee has to essentially start from scratch.

But after three months, I would say you are entitled to a polite reminder letter to the editor.