Startup options very slow and choppy

[Kallez]

Hello

Since upgrading to El Capitan, and dualbooting with Boot camp. Everytime when I want to change the startup device by holding the option key at startup, it takes very long to detect the mac and windows drive like 2-3 minutes, after detecting and I can choose the startup device, it is also very choppy and when I press left or right on the keyboard it can take up to 1 minute before it moves to either Mac or Windows partition. This never happened before and I notice it happen after a upgrade to El Capitan.
Using a Macbook Pro retina 13 Early 2015.

Anyone know solution to this or why is it happening? I tried scanning the SSD for errors but none detected, and when using Windows or El Capitan everything works flawlessly, except when I go to startup options choosing the partition I want to boot to.

Regards
Kallez

 

[chabig]

Are you using FileVault encryption? If so, that would slow things down while the computer decrypts some stuff to find out what boot options are available.

 

[Kallez]

Are you using FileVault encryption? If so, that would slow things down while the computer decrypts some stuff to find out what boot options are available.

No, file vault is off. I have tried smc reset and pram reset also but still the same problem.

 

[chabig]

Time to try troubleshooting...disconnect all external devices. What happens then?

 

[Kallez]

Same thing, I even disconnect a transcend memory card.

 

[chabig]

I'm sorry then. I can't think of anything else. It's possible that El Capitan just behaves that way for reasons Apple may not have shared. I don't dual boot so I don't see it. If you are using both environments regularly you might seriously consider Parallels.

 

[grahamperrin]

This may be a duplicate of an El Capitan topic in a different area: Slow boot when choosing startup disk

@Kallez would you agree?

 

[DeltaMac]

random questions...
Even though you are not using File Vault - do you have Bitlocker encryption enabled for Windows?

Did you upgrade to El Capitan, and your Windows partition was already installed prior to El Cap upgrade?
What did you use to scan your drive? If you used Disk Utility for that, then might be helpful to also use a Windows equivalent.
After reviewing other threads - El Cap may be working normally for you, with long waits for the Option-boot select screen. And, installing an alternate boot selector, such as rEFInd, might be a good choice, too.