It's sad that the 'light-weight-ness' of a distro seems to superficially only be measured on how much RAM it uses, instead of CPU load or disk I/O which have a much bigger impact on how snappy an OS feels than RAM, as most linux distros don't use that much RAM anyway to make a difference once you launch a memory hog like Chrome, but they can hit the CPU and disk hard enough to make a dent on performance, especially on older systems with HDD and slow CPUs.