Whatever they are, blasters ain't lasers. And they're never described as lasers in the flicks! Like it says in those crazy technical manuals, they're slugs of superheated gas or whatever.
Painstakingly examining the films frame-by-frame to see roughly how far and how fast bolts travel, Savage gets results in the 130-135mph range—slow enough for an alert person to dodge after firing, given some distance.