My shatter barely moved

You turned the Speed up, scrubbed the Time, and the pieces shuffle a little and stop. Nothing errors, and turning the Speed higher does almost nothing.

The pieces are starting underground#

This is the usual cause and it is not obvious.

Shatter has a ground height, Ground Y, and it defaults to zero. A shape built from a primitive is centred on its own middle, so half of it sits below zero before anything is thrown. Those pieces are already at or under the ground, so they are held there instead of flying, and the ones above barely clear it.

Seat the shape with Place On before you break it. With the underside at zero, every piece starts above the ground and the throw behaves.

Measured on a one-unit block: unseated, the result spans the same width at every moment from nought to two and a half seconds. Seated, it starts at exactly the block's size and grows steadily apart.

There is nothing to throw#

Shatter moves pieces that already exist. Give it a solid and it has one piece, which it moves as a single lump.

Fracture has to come first. And if you merged the pieces back together with Merge Geometry for performance, do that after the throw, not before.

The Time is past the end#

The pieces fly, fall, land and settle. Scrub far enough and you are looking at the aftermath, which can look almost like the original if they did not go far.

Come back toward the start. Somewhere in the first second is usually where it reads as destruction rather than as a pile.

It is moving, just not far#

Speed and Gravity work against each other, and the ground stops things early. If you want pieces to travel, lower the Gravity rather than raising the Speed: a piece that is thrown harder still lands at about the same time.