I have the exact same problem, progress bar sticks at 25% and delays for a while then runs to the end. I have now done a clean install of Big Sur and initially, I had the bootup time down to 30-35secs but now I'm noticing with each new bootup the time is now increasing. This morning I'm now up at 53secs (the slowest yet) and that's with all apps quit and nothing in login items. And apple say it's a normal bootup time but it's obviously slower for me to have noticed in the first place. So annoying!!
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Slow booting time
- Thread starter marfape
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In this post, it seems Apple has acknowledged there is a bug in Big Sur causing an incompatibility with Fusion drives causing the performance issues we are seeing: https://discussions.apple.com/thread/252176440?answerId=254797288022. Let's hope enough attention is drawn to this issue so Apple is forced to fix it.
Looks like there are no fixes. Big Sur is on version 11.3 and its startup time is just much slower than Catalina.
Big Sur clean install is 2x slower than Catalina on the same Macbook Pro Late 2013:
Big Sur clean install is 2x slower than Catalina on the same Macbook Pro Late 2013:
have
I honestly don't see the problem. It's not like you're rebooting your Mac every day and 15s extra is nothing dramatic. It took my iMac more than 5 minutes from power up to a workable desktop after upgrading to Big Sur. A clean install did nothing to fix it. Now I did another clean install with 11.3 and I'm at 30s. Couldn't be happier. So as far as I can tell they did address some major performance issues in 11.3 and 30s is perfectly normal for such an old laptop.
I honestly don't see the problem. It's not like you're rebooting your Mac every day and 15s extra is nothing dramatic. It took my iMac more than 5 minutes from power up to a workable desktop after upgrading to Big Sur. A clean install did nothing to fix it. Now I did another clean install with 11.3 and I'm at 30s. Couldn't be happier. So as far as I can tell they did address some major performance issues in 11.3 and 30s is perfectly normal for such an old laptop.
There is no fix. As each Macos iteration is released the boot time increases.Just upgraded my iMac 2017 (SSD) to Big Sur and facing the same issue.