Why do AOSP-based roms have worse graphics performance? - HTC Sensation

I want to start this off by saying that I don't intend to bash any of the AOSP dev's around. They're doing a bloody great job.
With that out of the way, it seems like every AOSP-based rom i try (whether it's cm10.1, cm10.2, cm11 (3.0/3.4 kernel), miui, carbon etc etc just to name a few), gaming performance is way below Sense based roms. Is this because the Sense drivers are better optimized for Sensation? Is it a GPU tweak I've missed?
For example, on Sense roms I can play Temple Run 2 on Best Graphics and Asphalt 8: Airborne on Medium without any form of stuttering. On AOSP-based roms however, this turns into a slideshow. Have I missed something here? I'm desperate for some decent AOSP-GPU performance.
~Shadow

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[Q] Is the performance of ICS ROMs slow for everyone else too?

I have tried a couple of AOSP-like ICS ROMs (HyperNonSense, Virtuous Inquisition 4.0) and I am not very happy with the performance. Pressing the back button often causes a small stutter or lag, and browsing (although fast) has lag on occasion or stutters.
It is not that the experience is 'bad', but it is not as fluid and fast as one would expect it to be from a dual-core phone with the kind of specs included within.
To give you a better idea, my Samsung Galaxy S (i9000), running the BlueLighting ROM (ICS 4.0.3) with a 'mild' OC to 1.2 GhZ runs buttery smooth, and beats my Sensation XE (ICS 4.0.3, tested at 1.2 GhZ 'underclock, 1.5 Ghz 'stock' and 1.7 Ghz 'OC') every time and in every situation: Browsing pictures, using stock browser, browsing applications, contacts, pressing the back button etc.
Why does a phone with a single-core CPU, clocked lower, and what seems to be inferior specs outperform a phone that should be doing much better?
I love AOSP experience, and I would ideally avoid any Sense-ROMs (although Sense-lite are ok, I suppose).
Can anyone tell me what their mileage is, with which ICS ROM, and whether you think there is a ROM I should try?
Thanks!
I also had the Virtous Inquisition Rom on my Sensation and i have to say it works very well.
Maybe you have to try another aosp rom like the Cyanogen mod9 from ultimate sensation,it also works very good for me
Thanks I will give it a try and let you know!
Also, can anyone suggest a good ICS kernel? I have had trouble finding a stable kernel. Some can work fine at speeds above 1.6GhZ, but some will not even boot -- perhaps they are not for ICS. I will have to look around. I am surprised there is (no offence!) little variety and option on offer in regards to kernels -- particularly for those interested in the more exotic CPU profiles.
I have also used both Hyper NonSense (1.5 currently, no longer being developed but is stable) and early Virtuous Inquisition releases. For me, both were quite fast - Hyper NonSense more so, but I haven't used a recent release of VI. In both cases, I stuck with the stock kernel distributed with the ROM.
FWIW, Hyper NonSense has also been giving me EXCELLENT battery life. It's a shame to see development stop on it.

Game lag on AOSP

This is a different game lag post compared to others because this is about Mad Skills Motocross, it's not like Temple Run where it was made perfectly for Android and you get no lag. It was originally on iOS and it was ported to Android by a different company and they ported it terribly and it's slow and laggy. However it's possible to make it play normally with no lag, I can do it by using a Touchwiz ROM that doesn't have lag in games, with GPU at 480 and CPU max at 1720. But for some reason even when I get those same GPU/CPU settings on AOSP it lags terribly. What could be causing this? What is it about AOSP that is making it lag? AOSP is usually faster in every aspect. I don't mind being on JellyBeans with a GPU OC kernel to get no lag in it but I miss AOSP's amazing battery life and fast UI, does anyone know what could be causing the lag in the game on AOSP? It's not a big deal I can give up on the game for AOSP but if anyone has ideas I'd love to hear them
Sent from my SCH-I535

Best 4.2 rom gaming wise?

I've already tried mackay and dark nexus rom. Both seem to have lags while playing games. On jb 4.1 gta vice city ran fairly smooth, however they run poorly on 4.2 so i'm asking which 4.2 rom has the best gaming performance?

ICS based ROMs (Viper, Elegancia) vs CM 12.1- Which runs better?

So I had to sell sell my current phone and I am going to use my sensation again for the next 2 months. I have tried the unofficial CM12.1 ROM and it is running surprisingly well, however CPU and RAM are constantly at 100%, rendering some simple tasks like Web browsing impossible (phone crashes).
l was thinking that the older ICS-based ROMs like ViperS or Elegancia may be better in terms of performance. Maybe the hardware of our favourite phone just isn't built for the software me have now...
Maybe there is a third alternative? What would be the best ROM for the Sensation in terms of performance?
ViperS is JB-based (4.1.2). Experiences can vary on a per-device basis, I personally find CM12.1 sufficient and issue-less, save the RIL bugs.

are roms worth it ??

i recently bought a nvidia shield k1 . i think the performance is pretty good.
what are the benefits of switching over to cm13 ?
are there any performance benefits ?
which is the best rom for this tablet ?
The NVIDIA stock ROM is pretty lightweight and has few issues. Only flash CyanogenMod if you need the extra features (like the theme engine) are willing to tolerate bugs (I had issues with memory leaks).
I tried Bliss and CM. I would have weird issues playing games. Found stock was better for gaming unfortunately. I love ROMs and flashing. I found GtrCraft's ROM here and it works very well. Nothing extra, but it is optimized a bit.
http://forum.xda-developers.com/shi...rom-optimized-stock-shield-tablet-k1-t3437791
I'm a noob and I'm happy with Nvidia stock ROM. Besides, the Mediaserver bug that I recently encountered. Though, that's apparently common even with custom ROMs.

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