Upgrading to 9.5 will resolve issue..I believe there was a bug in early 9 versions that wouldn't allow Traps page to load. I have a case opened working on a similar issue. When I went to version 9.1 Traps began loading extremely slow (30 seconds) no matter how many rows I requested. I then went to 9.5 and now Events web page loads slow (30 seconds). All other traps/events resources on the website (top xx on node details page, events summary) load quickly. It is only the primary Traps and Events pages that are slow.
Case # is 99257. I originally opened case 64389 for the Traps issue when I went to 9.1 and that case was never resolved...so I created the new case once events started loading slow.