Faster and more efficient alternative for Tunnelblick I have to use Tunnelblick (VPN) to be able to connect to a server, the problem is that Tunnelblick is very buggy and laggy and sometimes also causes wierd problems like overheating when the laptop is folded (it does not shut off). Or frequent crashes. 

Now I was wondering if there was a better alternative for doing so.

Kind regards,

Robbert
I recently switched from Tunnelblick to Viscosity. Awesome, never gives me that laggy trouble, but it requires a license. 

A pretty good free option is OpenVPN but I have had login issues with it sometimes. Once you're logged in it's solid though.