http to https migration will affect redirects?

Hi John,
could you please expand on your answer?
It is not clear to me,

Thank you very much!
D.

Hi John,
thanks for your reply.

I will try to be more detailed.

I have a blog, let’s name it http://blog.com
in my articles I have some links.

I created a separate website let’s call it http://lnk.com in which I installed your plugin and in which I set up thousands of redirects that look like this:

http://lnk.com/1
http://lnk.com/2
http://lnk.com/3
http://lnk.com/134324
etc.

Every time in http://blog.com I link to an external source I use the http://lnk.com/23423 format. It is kinda my own URL shortener.

Now I am about to update both:
http://blog.com and http://lnk.com from HTTP to HTTPS

I am worried that after I make this move, all my
http://lnk.com/134324 links will not work anymore, and I will need to go inside http://blog.com and update all thousands of links to https://lnk.com/134324

So the question:

Is this the case?
Will I need to update all links to https from within my articles?

Will the redirect be slower because for example a random redirect has to go from http://lnk.com/134324 to https://lnk.com/134324 and then to LANDING WEBSITE?

I see how this question looks complicated, I hope I made it more clear!

Thank you very much,
D.