Hi again,
Unfortunately it is likely that only minor improvements will be found. The proper way to address these performance issues is to replace the back-end code with a newer framework (rather than cobbling patches and workarounds together). This has been done a long while ago on the Patreon branch, but not the itch.io branch which is under legacy support only. If top speed and performance is absolutely important to you, I would humbly suggest trying the Patreon version, as it is vastly superior in many ways.