[Q] Sudden loss of performace

I have had the Sprint HTC EVO 4g LTE for about 4 months. It's a great phone but I doubt I'll see LTE for quite some time as I'm in a high tourist area where the population explodes over 10x in the summer months then backs down to just the locals in the off season (Myrtle Beach). They wheel in a half dozen COWs for the peak season.
My first EVO phone would not connect data (1 day old) and was replaced then next day. The second phone I rooted via RegawMOD EVO 4G LTE Rooter x64 prior to the first update and after 5 weeks it was replaced due to boot loop. () Performance was great until it would not boot. (replaced by Bestbuy as "Junked Out", showed Tampered", "Unlocked")
I'm on my 3rd phone, about 2 months old, kept completely stock but noticed within the last week or so an annoying slow down. It seems that anytime I either close an app or switch to the home page I see the "LOADING..." icon for up to 30-45 seconds before displaying a desktop screen. (Multi-task switching seems okay but slower). It's become quite a pain as the performance seems to have degraded quite a bit. Also when clicking on web URLs I often get 3/4 page loaded when it dumps me back to a desktop screen. (How rude!!) Using stock browser.
I have not allowed any automatic OTA updates hoping to root again when methods have become reliable to do so.
I've checked RAM and I typically have 1.5gb free, local phone storage (10gb) shows 9.7gb free and external (32gb sdcard) with 20.5gb free so I can't see any system resources as a problem.
Is there an app that can debug the file system to determine the reason for this behavior? It has to be the operating system as the problem? I know if I re-root the phone it will rebuild the OS and file system but I'm nervous about the Bestbuy maintenance plan.
Is there any app that can report detail what is causing the slow switching?

Currently Android 4.0.3
HTC Sense 4.0
Software version 1.22.651.3 71 ORD
HTC SDK API level 4.20
HTC Extension version_403_1_GA_8 #1
Kernel Version 3.0.8-01368-g6fdcee1
Baseband version 1.05.11.0606
Build 1.22.651.3 CL78702
Browser version Webkit/534.30
PRI Version 2.45_003
PRL Version 25006

Thanks!
Micro Maniac
Bytes-R-Us!

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