Peppermint 8 is a lightweight distro that uses LXDE by default, although combined with a customized Xfce base.
It's important to select the proper distro for your hardware, while I prefer Linux Mint, and obviously so do you, nothing wrong with that, it's just that a full fledged Mint 18.2 will cause issues by kernel upgrades alone. These may in itself cause things to break fast, as newer ones ship regularly. You're now likely on Kernel 4.8 & 4.10 is upcoming, that's when your 18.2 install will likely disintegrate fast.
You may also wish to consider Mint 18 Xfce, which doesn't have as much software installed by default, although you can add fairly much anything that's on the MATE edition w/out issue. Just avoid kernel upgrades, unless the changelog shows medium to high urgency, which would likely include security upgrades along with the kernel itself.
Personally, I feel that you should had stuck with Mint 17.3 and resolve any existing issues (other than browsers, of which you have a Topic on), by opening another Topic to discuss these, which after installing Mint 13 LTS to make sure my computer was OK, I reinstalled. It'll be the latest Linux Mint installed on the now 14 year old notebook, once support ends, if the notebook is still running, will give to a diehard XP friend to add to his collection of those computers, to him, the more, the merrier. To each their own, is the way I see things & don't hold that decision against him, although he finally gave into my suggestion to use the latest Linux Mint distro for making transactions, of which I provide him with a DVD after every release.
Should you decide to ride out Mint 18.2, you're likely in for a very rocky ride, and as stated in your other Topic, websites (a browser related issue) are going to render worse over time. I rarely have any issues with connecting to Bleeping Computer, unless the site has an occasional overload, which hasn't taken place in quite some time. If it's not a network issue, then I suspect hardware or any updates you've applied. You can test this by booting into the install media, which has no added plugins & see if you can connect to the site with Firefox in a Live session, if successful, then you have some unneeded plugins, or chose too many Level 4 & 5 updates (not recommended unless needed).
On this computer, you should follow Mint's conservative update policy (the middle option), which will provide security & software updates. In particular, some of the Level 4 updates can cause your computer to boot & run slow at the next reboot.