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> Apps installed as Snaps are slow to start-up. Why?

Part of the design, snaps are a compressed disk image that has to be decompressed the first time it's started after a reboot.

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That's only part of the story. There's other reasons, many of which have been improved over the years. For example the font cache would be generated on first launch, which was a slow operation. This was moved to happen when the snap is installed, which meant the install took longer, but first launch was much faster. For me, today, the Firefox snap and the Firefox deb take pretty much exactly the same amount of time.

Parent commenter here. Actually, as someone above answered in the thread above, the slow Snap startup seems to be fixed.

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