VPN slows down internet speed
This is the most common reason why people start looking at how to delete their VPN. Who would enjoy seeing their connection speed drop to unbearable lows, followed by constant lags? This problem stems from the technicalities of the VPN technology - it uses encryption to protect your data.
At least some negative impact on your internet speed is inevitable. But with that said, there are ways to speed up the connection of your Mac VPN client. The easiest option is to change your VPN server. Other than encryption, aspects that affect your internet speed the most are the VPN server’s workload and its distance to your location.
So before you uninstall VPN from your Mac, try connecting to a different VPN server, preferably one that’s less populated and is closer to you. For better results, use the Ping Test feature in VPN Unlimited - it will show which servers should work better for you (the smaller the ping, the better).