Repeat loop optimization?

[Glen Bojsza]

I tried the following experiment.

I have a field with 10000 lines and I want to convert the first word to 
seconds

Method 1

Break the 10000 lines into 5 separate loops. The start time and end 
time was recorded for each loop - ie when a loop completed the next 
loop started.

TIME TO PROCESS 21 seconds

Method 2 is the same script but with fire# commented out (firebig is 
the only loop)

TIME TO PROCESS 1 minute 27 seconds

This is a substantial difference...can anyone give me some pointers on 
how I should optimize repeat loops. I thought that doing the one big 
loop should be as fast as the multiple loops?

on mouseUp
fireUpdate
end mouseUp
on fireUpdate
  fire1
  fire2
  fire3
  fire4
  fire5
  --firebig
end fireUpdate
on fire1
  put long time into fld s1
  put line 1 to 2000 of fld "out" into ftemp1
  repeat with l = 1 to 2000
  get  word 1 of line l of ftemp1 && word 2 of line l of ftemp1
    convert it to seconds
    put it & cr after stime1
end repeat
put long time into fld e1
end fire1
on fire2
  put long time into fld s2
  put line 2001 to 4000 of fld "out" into ftemp2
  repeat with l = 1 to 2000
  get  word 1 of line l of ftemp && word 2 of line l of ftemp2
    convert it to seconds
    put it & cr after stime2
end repeat
put long time into fld e2
end fire2
on fire3
  put long time into fld s3
  put line 4001 to 6000 of fld "out" into ftemp3
  repeat with l = 1 to 2000
  get  word 1 of line l of ftemp1 && word 2 of line l of ftemp3
    convert it to seconds
    put it & cr after stime3
end repeat
put long time into fld e3
end fire3
on fire4
  put long time into fld s4
  put line 6001 to 8000 of fld "out" into ftemp4
  repeat with l = 1 to 2000
  get  word 1 of line l of ftemp1 && word 2 of line l of ftemp4
    convert it to seconds
    put it & cr after stime4
end repeat
put long time into fld e4
end fire4
on fire5
  put long time into fld s5
  put line 8001 to 10000 of fld "out" into ftemp5
  repeat with l = 1 to 2000
  get  word 1 of line l of ftemp1 && word 2 of line l of ftemp5
    convert it to seconds
    put it & cr after stime5
end repeat
put long time into fld e5
end fire5
on firebig
  put long time into fld sb1
  put line 1 to 10000 of fld "out" into fbtemp1
  repeat with l = 1 to 10000
  get  word 1 of line l of ftemp1 && word 2 of line l of fbtemp1
    convert it to seconds
    put it & cr after sbtime1
end repeat
put long time into fld eb1
end firebig
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