My crappy old 2018 Chromebook is still just about usable with 2GB but has gone from a snappy system to a lethargic snail.. and getting slower every update.. Yeah for progress!
>>boznz+(OP)
eMMC Chromebooks are notorious for storage-related slowdowns. If it's an option, booting a ChromeOS variant or similar distro off a high-speed microSD, over USB, or (least likely with a Chromebook) via PXE might confirm.