# How to fix Iphone devices from being extremely slow compared to anything else

**URL:** <https://community.wowza.com/t/how-to-fix-iphone-devices-from-being-extremely-slow-compared-to-anything-else/43953>\
**Category:** Wowza Streaming Engine\
**Created:** [September 22, 2014, 5:33am UTC](https://community.wowza.com/t/how-to-fix-iphone-devices-from-being-extremely-slow-compared-to-anything-else/43953 "2014-09-22T05:33:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Paul\_Jewell](https://avatars.discourse-cdn.com/v4/letter/p/779978/32.png) [@Paul\_Jewell](https://community.wowza.com/u/Paul_Jewell)\
**Post date:** [September 22, 2014, 5:33am UTC](https://community.wowza.com/t/how-to-fix-iphone-devices-from-being-extremely-slow-compared-to-anything-else/43953/1 "2014-09-22T05:33:24Z")

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If you are anything like me, you don’t care much for I-devices either, but for a specific client the majority of users will be viewing a stream on their Iphones and Ipads and I am looking for a method of getting comparable performance on these devices relative to android and PC devices. So far, I use Jwplayer for the web/android clients and for the IPhone clients I use a video tag with a source pointing to the “playlist.m3u8” live link. These methods were first implemented by a co-worker who is no longer with the company, so I am not 100% sure if they are the correct way to play. The Jwplayer works great with a latency of about 10-15 seconds, which is acceptable. On the Iphone devices the lag is about 30-40 seconds behind the video projected by the other devices. This is almost 60 seconds overall and is not desirable for the application. I assume this might be due in part to the protocol using TCP instead of UDP, but I have not really researched this to confirm. I can not think of another reason for such a drastic difference.

Can anyone give me any pointers to fix this for Iphones? I can post code I use if that is required.

Thanks,

-Paul

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**Author:** ![sal\_jefferson](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)\
**Post date:** [September 22, 2014, 7:59am UTC](https://community.wowza.com/t/how-to-fix-iphone-devices-from-being-extremely-slow-compared-to-anything-else/43953/2 "2014-09-22T07:59:54Z")

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Hello there and welcome to the Wowza support forum.

As a general rule 3 chunks are required by iOS devices for streaming to begin. Each chunk is set to 10 seconds by default. So that would be around 30 seconds latency.

If you use a keyframe interval of 1 frame per second you can lower the cupertinoChunkDurationTarget to 1 second(1000) and get the latency down to closer to 3 seconds.

Also, you might experiment with a setting of “1” for cupertinoPlaylistChunkCount but probably not a good idea for iOS.

This guide explains the configuration in more detail:

[How to configure Apple HTTP Live Streaming packetization (cupertinostreaming)](https://www.wowza.com/docs/how-to-configure-apple-hls-packetization-cupertinostreaming%28iOS)

Thank you, and I hope this is helpful for you. Please let us know if there is anything else we can assist you with in the future.

Salvadore