beta only means this one isn't 'officially released'.
But none KM-version now could be 'released' unless the community decides.
And sure, all betas are good-working builds.
I think old versions couldn't boast of being really lighter but the OS can be point of choice - old Win98 cannot work with newer KMs without modern unofficial updates, including
kernelex.
And old versions are definitely less compatible with number of modern web-sites.
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Using
K-Meleon-1.6.17db+ /
KM-16-S2014
1.6beta2.5 by JamesD
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Recommending K-Meleon Twin+
Try and
discuss it!!!