Does the laptop where it lags have screen scaling ? Eg a 125*% zoom on windows. If so you need to disable scaling foe 0 A.D. by editing properties or disable it entirey
Hey thanks for reaching out, The patch is here https://github.com/0ad/0ad/blob/83e81362d850cc6f2b3b598255b873b6d04d5809/libraries/source/spidermonkey/FixSharedArray.diff
You can see all the patches we apply here
https://github.com/0ad/0ad/blob/83e81362d850cc6f2b3b598255b873b6d04d5809/libraries/source/spidermonkey/patch.sh
You cannot do that, because the drop shadow / glow effects are dependent on what's above, and that's a bit hard to implement.
Maybe you could consider another display approach for them, like at the bottom
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Hit me up if you need anything