It is just lot of memory leaks.

With VPN turned on leaks are huge, especially with some large traffic.

With VPN off it also happens, just leaks are much smaller, but also pile up with time.

Before 43 version release development team really need to find most leaks.

Previous author is right.

Main memory leak is located in VPN code, most probably in decryption buffers related code.

As video viewing lead to large transfer amounts you get your leak leading to OOM issue much faster.

Also happens with heavy images loaded sites.

Bug was introduced recently and especially bad became in latest 42 version.