How to download more RAM

Zram basically takes a part of your actual physical ram and stores compressed ram contents in it. The gains are crazy

Because regular swap is slower than Zram.

1. Install zram-generator. On Archlinux, its

   pacman -S zram-generator
   

2. Configure your /etc/systemd/zram-generator.conf

   [zram0  ]
   zram-size = ram * 2
   compression-algorithm = zstd
   swap-priority = 100
   fs-type = swap
   

   Now we just need to care about zram-size, it actually refers to the uncompressed size of Zram, not the compressed one, this means it will use a lot less of you actual physical ram. Please experiment with it until you find the sweet spot. For me it is 4 times the size of the ram. It works fine.

3. Start Systemd service.

   systemctl daemon-reload
   systemctl start systemd-zram-setup@zram0.service 
   

   Note that you don't need to enable it. It will happen automatically upon reboot.