Most of my experience with this actually comes from RoR. I worked on one so where rendering slowed everything down to a grind, but more often than not it was ma

Most of my experience with this actually comes from RoR. I worked on one so where rendering slowed everything down to a grind, but more often than not it was making Yu noptimized queries, too many queries, inefficient calls to other services. I used to work as a consultant, so this was true for quite a few apps. However, I also usually was the person most interested in relational databases and my view might have selection bias.