I had an Aspire One D270 laptop with a 32-bit Intel Atom CPU and 1 gigabyte of RAM, so I installed Debian with Xfce on it, but even then it’s running way too slow.
Is there anything I can do to make the laptop faster and more responsive given its limited memory?
On a laptop that old, I highly recommend a 32 bit distro.
Q4OS with Trinity: https://q4os.org/
Antix https://antixlinux.com/
DSL https://www.damnsmalllinux.org/
You could also enable ZRAM If it is not already.