After installing Dell’s Sonicwall GlobalVPN, a lot of my users experiencing slowdown in network (WiFi) performance. However, it works fine with the LAN adapter. At first, I thought it only happened to Lenovo laptops, then only brands having such issues as well.
After diagnosing the issue, it was a bug caused by the installation and Intel-based wireless adapter.
Well, the solution is to install the following patch by Microsoft itself.
Here is the link :