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What do you expect? 24 bit colour MEANS 24 bits (size of data) for EVERY pixel, consisting of Red , green and Blue pixels at a range each of 8bits and now 10/12/16 bit range, so RGB = 3x 8bit = 24 bits of data to represent ONE pixel. Multiply by the width of the image and the height gives you the total bits of data needed for each frame. Divide by 8 to get the total number of bytes of data. Then divide by 1,024 and again and again to get KB, MB, GB sizes. Its a LOT of data. TIFF is meant to be for uncompressed data, its been around for decades and is widely supported and robust file format (unlike DNG which is hardly used, its aimed at cameras). But even still the same data amount if what is captured and has to be stored, most file formats have options for uncompressed and compressed data storage. Compressed generally means losing data.
You're using low end free software so be thankful it supports anything besides JPEG files. All that data takes time to copy around on memory cards and hard drives, no storage hardware has instantaneous speeds, so again the cheaper options limit how fast files can be copied around, which HAS to happen when converting files from one format to another. Most freeware software also only implements the simpler file format options, not always All of them and the routines for processing may be simpler and less accurate, especially when "ultra fast" is a big feature they advertise.
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