I just recently updated the software to version 1.4.03 and it seems to have significantly slowed down the time it takes to set up a preview and/or start engraving. It takes nearly 10 minutes before it will even start a job. If I try to hit cancel it says lightburn isn’t responding and gives me the option to close the program or wait for it to connect again.
Are you using offset fill on a large or complex shape? The math involved for offset fill can be quite intensive. I have found that a 4 leaf clover shape will absolutely make LB lock up when you are set to offset fill.
Change to normal fill and see if it will improve your start delay.