Verizon Wireless has announced that it has been “optimizing” video apps on its mobile network, an admission made after several subscribers complained that their mobile data speeds were being throttled whenever they streamed videos on YouTube or Netflix.

Users of Verizon were recently accusing the company of providing slower-than-advertised speeds during streaming of videos at Netflix and YouTube.

A Verizon spokesperson said, “We’ve been doing network testing over the past few days to optimize the performance of video applications on our network. The testing should be completed shortly. The customer video experience was not affected.”

Earlier, the Verge reported that many Verizon users were reporting slower-than-advertised speeds whenever during streaming of Netflix and YouTube videos. Some reported maximum internet speeds 10 Mbps whenever they used the services over their mobile data network.

Those same Verizon users added that they were getting faster download speeds advertised by the company when they connected to other websites and apps.

Verizon, however, couldn’t clarify if it has any plans to cap the speeds of video apps like Netflix and YouTube in any manner once the ongoing network testing is complete.