If there were any sort of interference problems or Wifi issues you would notice by eratic or lower client performance than normal. I often use iperf to validate an install. Airwave typically takes 5 minutes to gather client throughput data updates. Whilst you can view the performance on the iperf server (you need to run iperf on the clients and communicate back to an iperf server on the LAN) you should also be able to see the client throughput on Airwave after a few minutes. I suggest you do some baselineing with the clients you have to give you an idea of what to expect. Different vendor chipsets will also show different performance. For example a 2x2 2 SS client will perform better than a 1x2 2SS client. It will give you a good measure of the peak client performance but you should expect some variation between different client types. It can perform TCP and UDP throughput tests. It is a well know network performance tool available for free download from It can be run on Windows and Mac clients. So maybe the problem sits between the Synology NAS and the router.One tool you can use to measure client performance is iperf / Jperf. So streaming a film with 61 MBit/s bitrate (audio and video combined) should work without problems I guess. In fact concerning the communication between Router and iPhone and have constantly about 170 MBit/s. Update 2: My router has an iOS app for measuring the WiFi speed. Also the data rate seems to be very fast and enough for 4K. I just did a test with the WiFiPerf Endpoint app on my iPhone and then this command on my Synology (you need docker installed, and you might need to run. Update: At least my router says that the iPhone is in 5 GHz and also in WiFi AC mode. Web based WiFi speed tests for iPhones rely on uploading/downloading data from the Internet. Signal collection in dBm is achieved by using an agent running on a non iOS smartphone, tablet, or computer that sends RSSI information to the app via an IP connection. For a list of the different options, just run iperf3 without any switches. It should output the following: iperf3 -v iperf version 3.0-BETA4 () If you're familiar with iperf2, many of the command-line switches are the same. But WiFi standard AC should be capable of MUCH more. The iPerf3 client/server is compatible with WiFiPerf and iPerf3 apps. Once installed, verify you've got the correct version with 'iperf3 -v'. Seems to be a bit low, doesn’t it? Since some of the videos have 20 MByte/s (not Bit!), this cannot work. I used the app and got the following results: 61-WiFiPerf for iMac 4,- WiFiPerf for iPad 4,- (measure the WLAN. Or is there an option to do the transcoding maybe on the NAS? 60-muCommander Free (GPL) for Mac, Linux, Windows. I guess the Synology should not be much of a problem because playing via ethernet cable works fine. But with WiFi AC standard it should be possible to do this, no? So I assume the buffer can‘t be filled fast enough. But after some seconds the loading began again. The loading indicator kept spinning very long and then the video run smoothly. My motivation is rather pragmatical: I don‘t want to downsize (convert) each and every 4K file I have for this use case. Of course I know I cannot expect a too great result because of the iPhone XR‘s relatively low resolution. Now I wanted to stream a 4K file to my iPhone using Infuse. the room in question is about 5 meters away from the router with no walls in between.
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