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A comic with 300 pages are 300 images in comic pages dimensions. Depending on the resolution, the size can differ vastly, but even if each image has only 1mb, we speak about 300mb here.
If you want to reduce the size, you have to extract the images and change the resolution and/or the compression rate. You have to experiment, what is acceptable for you. The biggest problem will be the readability of the text.
One free app to do batch conversions of images is IrfanView. If you can write batch scrpits, you could maybe write a little one, that extracts a cbz, resizes the images and rezipps them. But you will lose some quality.
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