Is it just me, or is Manjaro XFCE using more RAM lately?

I think a lot of the comments so far have no real evidence to support some of the speculations

RAM usage on htop is shown in binary units Gibibytes and Mebibytes instead of decimal units Gigabytes and Megabytes

  • 1 GiB = 29 bytes = 1,073,741,824 bytes
  • 1 GB = 109 bytes = 1,000,000,000 bytes

My system has a few modifications from stock Manjaro and has been rolling for over 5 years

$ free -h
               total        used        free      shared  buff/cache   available
Mem:           7.7Gi       538Mi       6.7Gi       4.0Mi       505Mi       7.0Gi
Swap:          3.9Gi          0B       3.9Gi

My partner’s Xfce has not been modified much from standard Manjaro install and has only been rolling for 18 months

$ free -h
               total        used        free      shared  buff/cache   available
Mem:           7.8Gi       493Mi       6.7Gi        57Mi       578Mi       7.0Gi
Swap:          3.9Gi          0B       3.9Gi

Both systems have 8GB (7.45 GiB) RAM installed

So these systems are using approximately 6% of available RAM when booted
But your system is only using about 3.5% of available RAM

I do not think that having a bit more RAM used when OS is first booted will impair performance of Xfce when in use

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