2 sentences

1. 网络延迟太高，视频通话一直卡顿。

   Wǎng​luò yán​chí tài gāo, shì​pín tōng​huà yī​zhí kǎ​dùn.

   The network latency is too high, and the video call keeps lagging.

   Source: Dong Chinese Dictionary

2. 他下载了一个游戏加速器以解决网络卡顿问题。

   tā xià​zǎi le yī gè yóu​xì jiā​sù​qì yǐ jiě​jué wǎng​luò kǎ​dùn wèn​tí.

   He downloaded a game booster to solve the network lag problem.

   Source: Dong Chinese Dictionary