As I've stated from beta 1, don't use other plugins with 4.0. As @Slattz said, it uses too much memory. But using this much memory might lead to corruption, bricked saves or just break 4.0's usability. I wouldn't completely trust any plugin that you download outside of what I release. A plugin is compiled code. And with code, the code can be malware. If the source is open, look through it yourself to make sure it checks out, or ask a Dev to.