First thing to try: purge all memory & caches. It would also be enlightening to know what you consider to be "plenty of memory".
If you have a lock at my memory usage in the task manager lots is left. I also did clean my cache.
Hi Alexander Eberhard,
Sorry to see you having trouble with too much memory usage and working with effects. I have similar results with around 16 GB RAM and 4K Long GOP footage on my Mac. However, on my PC I have 32 GB RAM and I can preview a lot more footage.
Can you try some different footage and see if you get the same results? Let us know if you make any progress or if you find a solution for better RAM usage besides adding more physical RAM.
Adding more RAM is what I would suggest as it seems to make a huge difference between my two systems.