1) Dawdler 2) Dilatory 3) Dilatory one 4) Foot-dragger 5) Idler 6) Lazybones 7) Loiterer 8) Person failing to keep up 9) Shirker 10) Slacker 11) Slow mover 12) Slow person 13) Slowcoach 14) Someone who lags behind 15) Straggler 16) Unpunctual 17) Wasting time 1) Dawdler 2) Dilatory 3) Idler 4) Lagger 5) Lingerer 6) Loiterer 7) Pokey 8) Poky 9) Potterer 10) Putterer 11) Slow 12) Slowcoach 13) Slowpoke 14) Straggler 15) Strayer 16) Trailer 17) Unpunctual 
• (a.) Slow; sluggish; backward. • (n.) One who lags; a loiterer.
Lag'gard adjective [ Lag + - ard .] Slow; sluggish; backward. Lag'gard noun One who lags; a loiterer. 
Laggard is a business slang expression for an underperforming stock.
someone who takes more time than necessary[Intelligent words] someone who takes more time than necessary