3s cooldown for a 47% shield jump speedup, versions 1.0-1.2.1 at least. according to Lightos these “nerfed shield jumps” are a botw leftover, although it was stronger and affected height there.
doResetCamera();
tas::input(1, KEY_X);
tas::input(1, NONE);
tas::input(1, KEY_ZL|KEY_A); // neutral shield jump
tas::input(86, NONE, 0,32767); // 86
tas::input(1, KEY_X, 0,32767); // jump
tas::input(1, NONE, 0,32767);
tas::input(1, KEY_ZL|KEY_A, 0,32767); // shield jump at 5.1m/s
tas::input(30, NONE);
doResetCamera();
tas::input(1, KEY_X);
tas::input(1, NONE);
tas::input(1, KEY_ZL|KEY_A); // neutral shield jump
tas::input(88, NONE, 0,32767); // 88
tas::input(1, KEY_X, 0,32767); // jump
tas::input(1, NONE, 0,32767);
tas::input(1, KEY_ZL|KEY_A, 0,32767); // shield jump at 7.5m/s
tas-doShieldJumpsForward-speed-5.1-7.5.mp4 (download)