#Octave, 122 120 119 108 bytes

I misread the challenge and created an infinite loader that restarted at 0 once it passed 100. Making it into a one time only loader:

a='\|/-';for i=0:100;clc;disp(['Loading ',a(1),' ',num2str(i),' %']);a=a([2:4,1]);pause(0.749*rand+.001);end

Circulating a, a=a([2:4,1]) was flawr's idea here. Also, saved 2 bytes by skipping the parentheses after rand thanks to MattWH.

Octave, 122 120 119 108 bytes

I misread the challenge and created an infinite loader that restarted at 0 once it passed 100. Making it into a one time only loader:

a='\|/-';for i=0:100;clc;disp(['Loading ',a(1),' ',num2str(i),' %']);a=a([2:4,1]);pause(0.749*rand+.001);end

Circulating a, a=a([2:4,1]) was flawr's idea here. Also, saved 2 bytes by skipping the parentheses after rand thanks to MattWH.

#Octave, 122 120 119 108 bytes

I misread the challenge and created an infinite loader that restarted at 0 once it passed 100. Making it into a one time only loader:

a='\|/-';for i=0:100;clc;disp(['Loading ',a(1),' ',num2str(i),' %']);a=a([2:4,1]);pause(0.749*rand+.001);end

Circulating a, a=a([2:4,1]) was flawr's idea here. Also, saved 2 bytes by skipping the parentheses after rand thanks to MattWH.

#Octave, 122 120 119 108 bytes

I misread the challenge and created an infinite loader that restarted at 0 once it passed 100. Making it into a one time only loader:

a='\|/-';for i=0:100;clc;disp(['Loading ',a(1),' ',num2str(i),' %']);a=a([2:4,1]);pause(0.749*rand+.001);end

Circulating a, a=a([2:4,1]) was flawr's idea here. Also, saved 2 bytes by skipping the parentheses after rand thanks to MattWH.

#Octave, 122 120 119 bytes

This was horribly long :/ but I can't find a way to make it shorter... Saved two bytes thanks to MattWH (rand instead of rand()).

i=0;a='\|/-';while 1;clc;disp(['Loading ',a(1),' ',num2str(mod(i++,101)),' %']);a=a([2:4,1]);pause(0.749*rand+.001);end

Circulating a, a=a([2:4,1]) was flawr's idea here.

#Octave, 122 120 119 108 bytes

I misread the challenge and created an infinite loader that restarted at 0 once it passed 100. Making it into a one time only loader:

a='\|/-';for i=0:100;clc;disp(['Loading ',a(1),' ',num2str(i),' %']);a=a([2:4,1]);pause(0.749*rand+.001);end

Circulating a, a=a([2:4,1]) was flawr's idea here. Also, saved 2 bytes by skipping the parentheses after rand thanks to MattWH.