Edit 2: to everyone suggesting an SDD: i know. Look, if this guy had enough $$$ for an SSD, he could buy a used lappy less than half the age of this one that has an ssd and 2-3x the memory.
Currently, my buddy has a budget of $0, and, if he ever has money to spend, it will be on a newer computer, not upgrading this one. Thx!
My buddy’s old laptop was useless running Windows 7. I wiped it, put on Linux Mint (MATE), and it’s humming along just fine.
Edit: I really love helping people out like this. This guy is in his late 60s and has no other computer. He told me he hasn’t been able to use it in years (I believe it!), so I told him I could wipe it and make it usable again. He was thrilled!
After trying LM Cinnamon, I found it was a bit too much for this machine (Core 2 Duo “Penryn” @ 2.3GHz, 2.77GB Memory, Intel Series 4 Integrated Graphics). I reinstalled with LM MATE, and found it more responsive. I did the standard secondary installation of all the goodies like multimedia codecs, TTF support, battery tweaks, etc. I set up snapshots and the firewall, and installed UBlock Origin in Firefox. I updated everything. Shockingly, the battery still gets about 90-120 minutes, which blows my mind. The damn thing is 18 years old!
So, it’s still slow to launch stuff, as it’s running off of a slow HDD, but it manages to run most things just fine. It’s certainly far more responsive than Win7, and it enables my buddy to enjoy safe, secure, and modern web browsing (which is pretty much all he uses it for).
I've been putting together a lot of old laptops for friends and family, so here's my opinion based on my experience:
Your CPU speed is ok (that CPU scores 932 passmark points, which is ok for dekstop usage and youtube at 360p (you should set up his youtube at 360p, and to not autoplay). If this was Chrome, that cpu could do 480p, but firefox is much slower than chrome on youtube. The difference in speed is not visible on fast systems, but it is visible on very old ones (anything less than 1500 passmark points).
Your biggest problem is the RAM. You have only 2.77 GB of RAM, which is NOT enough for normal web browsing in this day and age -- if you're using lots of tabs. The moment you will open more than 2-3 tabs with heavy websites (e.g. facebook, nytimes, and linkedin), you will start swapping like crazy with Cinnamon. So your user will always have to be conscious of what apps they have open (and make sure you configure 4 GB of swap too, just in case).
Mate and XFCE should be using less RAM, indeed (about 600-800 MB instead of 1.3 GB on Cinnamon). I find XFCE more stable personally, and it only uses 100 MB more RAM than Mate on average. The only good thing Mate has over XFCE is that it comes with a user administrative gui app. I usually install that on xfce ("mate-user-admin").