If you want to use your raspberry pi in headless mode (no monitor connected), you can decrese the number of memory from your gpu to gain more free memory.
Open the file "/boot/config.txt" and search for something like "gpu_mem_". The advice is to set it to something like "64" or "48". Otherwise it is possible that your pi will not boot.
Since amazon bundles its prime with the video steaming, i wanted to check if i can use my raspberry pi with this amazon service also. I searched for some howtos on the web but only found outdatedentries.
At the end, it turned out it was working in the past and it is working in the present for windows pcs with a lot of horsepower under the hood. Since amazon bundles a lot of DRM-sh*t, it is impossible to get something done on a pi so far.