I've been spending some time optimizing the plugin because I have a couple CBZs that are kinda slow to load and navigate. I found out that no matter what I do, the GDK libraries that handle image loading are slow on these types of files.
Some rules of thumb:
"Progressive" JPEGs are slow to load, on the order of 4-10x slower.
Reasonably sized PNGs and "Baseline" JPEGs are much better.
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