i.MX ProcessorsのトピックRe: Android 14+ performance issues (Janky frames)

Android 14+ performance issues (Janky frames)

JK-dev — Wed, 22 Oct 2025 15:13:13 GMT

Hello,

We are using a custom board based on IMX8MP and noticed some performance issues when upgrading from Android 11 to Android 14. We noticed that transitions and animations feel laggy when using the device.

For evaluation, we performed the same tests on the IMX8MP EVK board. We were taking a look at the gfxinfo of the device and saw that there are huge differences in Janky frames, Number High input latency, and GPU percentile.

Android 11:

Total frames rendered: 1372 Janky frames: 204 (14.87%) 50th percentile: 7ms 90th percentile: 34ms 95th percentile: 77ms 99th percentile: 200ms Number Missed Vsync: 91 Number High input latency: 274 Number Slow UI thread: 89 Number Slow bitmap uploads: 1 Number Slow issue draw commands: 61 Number Frame deadline missed: 145 50th gpu percentile: 2ms 90th gpu percentile: 3ms 95th gpu percentile: 3ms 99th gpu percentile: 4ms

Android 14:

Total frames rendered: 1136 Janky frames: 429 (37.76%) Janky frames (legacy): 600 (52.82%) 50th percentile: 29ms 90th percentile: 73ms 95th percentile: 113ms 99th percentile: 250ms Number Missed Vsync: 130 Number High input latency: 755 Number Slow UI thread: 254 Number Slow bitmap uploads: 3 Number Slow issue draw commands: 376 Number Frame deadline missed: 429 Number Frame deadline missed (legacy): 342 50th gpu percentile: 4ms 90th gpu percentile: 23ms 95th gpu percentile: 23ms 99th gpu percentile: 24ms

Android 15:

Total frames rendered: 1093 Janky frames: 318 (29.09%) Janky frames (legacy): 639 (58.46%) 50th percentile: 18ms 90th percentile: 97ms 95th percentile: 105ms 99th percentile: 109ms Number Missed Vsync: 221 Number High input latency: 1028 Number Slow UI thread: 145 Number Slow bitmap uploads: 0 Number Slow issue draw commands: 317 Number Frame deadline missed: 318 Number Frame deadline missed (legacy): 309 50th gpu percentile: 11ms 90th gpu percentile: 4950ms 95th gpu percentile: 4950ms 99th gpu percentile: 4950ms

Is this a known issue, or are there any hints on how we could solve this issue?

Re: Android 14+ performance issues (Janky frames)

danielchen — Thu, 23 Oct 2025 08:25:30 GMT

Hi @JK-dev

Yes, this is a known issue on Android 14+ for i.mx8mp.

Android 14+ enables more extensive tracing and memory tracking for debug apps, which can slow down rendering by 1.5x-2x compared to previous versions. This affects UI thread, GPU scheduling, and input latency.

Please refer to below link for the quick workaround and more information.

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/Low-Performance-on-Android-14/ta-p/1991262

Regards

Daniel

Re: Android 14+ performance issues (Janky frames)

JK-dev — Thu, 23 Oct 2025 08:48:42 GMT

@danielchen Thanks for the reply. I saw this post before, but for my understanding, it would mean that if we are using a user build instead of a userdebug build, the issue should be gone; however, this isn't the case. For us, it seems to be the same in user and userdebug images; is there a different way to turn off debuggable for the whole system?

Re: Android 14+ performance issues (Janky frames)

danielchen — Thu, 30 Oct 2025 08:09:35 GMT

Hi @JK-dev

what display resolution you are using? Could you check if lowering it helps reduce GPU/CPU load and improves overall performance.

Re: Android 14+ performance issues (Janky frames)

JK-dev — Thu, 30 Oct 2025 13:21:33 GMT

Hi @danielchen ,

The Display only supports one resolution, which is 720p. I would guess this shouldn't be the issue.

Re: Android 14+ performance issues (Janky frames)

JuanJorge_Mendoza — Thu, 30 Oct 2025 16:40:08 GMT

Hello @JK-dev,

No, that shouldn't be an issue.

Could you share the test used to test the Janky frame? Also if possible, could you please run the same test on A12 and A13? It will help us to track down where the issue begins to appear.

Regards,
Juan Jorge

Re: Android 14+ performance issues (Janky frames)

JK-dev — Fri, 31 Oct 2025 08:11:09 GMT

Hi @JuanJorge_Mendoza ,
Thanks for the reply! As a test for the Janky frames, we just started the system and rebooted once, so we don't have issues caused by any first boot optimizations, and moved around inside the Settings App. Then we read out the gfxinfos through:

adb shell dumpsys gfxinfo

If you would say this is a valid test, I am happy to perform it on A12, A13, and A16.

Re: Android 14+ performance issues (Janky frames)

JuanJorge_Mendoza — Fri, 31 Oct 2025 18:56:09 GMT

Hello @JK-dev,

Yes, please run the same test and forward the results.

Regards,
Juan Jorge

Re: Android 14+ performance issues (Janky frames)

JK-dev — Tue, 04 Nov 2025 15:25:28 GMT

Hi @JuanJorge_Mendoza ,
I did tests on A16 and A13.

Android 16:

Total frames rendered: 946 Janky frames: 414 (43.76%) Janky frames (legacy): 631 (66.70%) 50th percentile: 30ms 90th percentile: 113ms 95th percentile: 200ms 99th percentile: 350ms Number Missed Vsync: 180 Number High input latency: 764 Number Slow UI thread: 265 Number Slow bitmap uploads: 7 Number Slow issue draw commands: 384 Number Frame deadline missed: 414 Number Frame deadline missed (legacy): 366 50th gpu percentile: 11ms 90th gpu percentile: 4950ms 95th gpu percentile: 4950ms 99th gpu percentile: 4950ms

Android 13:

Total frames rendered: 1000 Janky frames: 284 (28.40%) Janky frames (legacy): 397 (39.70%) 50th percentile: 12ms 90th percentile: 69ms 95th percentile: 129ms 99th percentile: 250ms Number Missed Vsync: 122 Number High input latency: 446 Number Slow UI thread: 176 Number Slow bitmap uploads: 1 Number Slow issue draw commands: 242 Number Frame deadline missed: 284 Number Frame deadline missed (legacy): 248 50th gpu percentile: 3ms 90th gpu percentile: 23ms 95th gpu percentile: 24ms 99th gpu percentile: 4950ms

Re: Android 14+ performance issues (Janky frames)

JuanJorge_Mendoza — Thu, 06 Nov 2025 02:00:10 GMT

Hello @JK-dev,

Thanks for the data, we will do an internal research and get back to you when we find anything.

Re: Android 14+ performance issues (Janky frames)

JuanJorge_Mendoza — Wed, 03 Dec 2025 18:24:52 GMT

Hello @JK-dev,

Sorry for the late response it took us a while to optimize the GUI for the 8MP.

The patch "0001-MA-22638-Update-expected-present-time-to-optimize-re.patch" is used to optimize the refresh rate in framework/native. Another two patches need to be applied in vendor/nxp-opensource/imx

Please let us know if that solve your problem

Re: Android 14+ performance issues (Janky frames)

JK-dev — Thu, 18 Dec 2025 09:04:34 GMT

Hi @JuanJorge_Mendoza ,

Sorry for the late reply, I was on holiday. Thank you for the patches! We tested your patches, and we can see that there is a slight improvement when navigating around. However, when it comes to higher loads or more Animations, the system remains very laggy, and most frames arrive way too late. To reproduce this, you could, for example, go to Settings -> Apps -> All Apps -> Include System Apps and scroll through that list. You will see that more than 50% of the frames are late.

Re: Android 14+ performance issues (Janky frames)

joanxie — Fri, 19 Dec 2025 02:41:41 GMT

when it comes to higher loads or more Animations

> is it worse than before? Is there any specific performance comparison data between using this patch and not using this patch?

Re: Android 14+ performance issues (Janky frames)

JK-dev — Fri, 19 Dec 2025 10:56:51 GMT

Hey @joanxie ,

No, the performance is slightly better than before.
Without the patches:

Total frames rendered: 1015 Janky frames: 376 (37.04%) Janky frames (legacy): 731 (72.02%) 50th percentile: 31ms 90th percentile: 150ms 95th percentile: 200ms 99th percentile: 400ms Number Missed Vsync: 262 Number High input latency: 1167 Number Slow UI thread: 368 Number Slow bitmap uploads: 1 Number Slow issue draw commands: 26 Number Frame deadline missed: 376 Number Frame deadline missed (legacy): 386 50th gpu percentile: 4ms 90th gpu percentile: 11ms 95th gpu percentile: 11ms 99th gpu percentile: 12ms

With the patches:

Total frames rendered: 2078 Janky frames: 594 (28.59%) Janky frames (legacy): 1050 (50.53%) 50th percentile: 21ms 90th percentile: 133ms 95th percentile: 200ms 99th percentile: 400ms Number Missed Vsync: 367 Number High input latency: 2045 Number Slow UI thread: 567 Number Slow bitmap uploads: 4 Number Slow issue draw commands: 68 Number Frame deadline missed: 594 Number Frame deadline missed (legacy): 580 50th gpu percentile: 4ms 90th gpu percentile: 11ms 95th gpu percentile: 11ms 99th gpu percentile: 12ms

As you see, the patch reduces the number of Janky frames, and the 50% percentile is better, but still not sufficient.

Re: Android 14+ performance issues (Janky frames)

joanxie — Tue, 23 Dec 2025 01:40:08 GMT

did your operation via UI? if yes, do you have any script or something specific steps? then I can forward to the android team to validate and debug further

Re: Android 14+ performance issues (Janky frames)

JK-dev — Mon, 05 Jan 2026 08:04:05 GMT

Hey @joanxie,

Yes, I used the UI to do that. I just went to the Android Settings -> Apps -> All Apps -> Show System Apps, and then I just scrolled through that List.

Re: Android 14+ performance issues (Janky frames)

joanxie — Tue, 06 Jan 2026 06:47:09 GMT

android team don't think this is a quantitative test, it's hard to compare the performance, do you have other test like script, the android team can use it to dump the performance to trace the root cause?

Re: Android 14+ performance issues (Janky frames)

JK-dev — Wed, 07 Jan 2026 08:41:39 GMT

Hey @joanxie,

It's basically the same test we did before. What would be a test for the Android team that is sufficient?

Re: Android 14+ performance issues (Janky frames)

joanxie — Thu, 08 Jan 2026 02:48:38 GMT

they hope you can give them a script to run the performance test and show the detailed performance degradation data, then they can reproduce this, because they don't find the same issue on their side