wiggle expression syntax:
wiggle(freq, amp, octaves=1, amp_mult=0.5, t=time);
Per Adobe Documentation:
freq value is the frequency in wiggles per second. amp value is the amplitude in units of the property to which it is applied. octaves is the number of octaves of noise to add together. This value controls how much detail is in the wiggle. Make this value higher than the default of 1 to include higher frequencies or lower to include amplitude harmonics in the wiggle. amp_mult is the amount that amp is multiplied by for each octave. This value controls how fast the harmonics drop off. The default is 0.5; make it closer to 1 to have the harmonics added at the same amplitude as the base frequency, or closer to 0 to add in less detail. t is the base start time. This value defaults to the current time. Use this parameter if you want the output to be a wiggle of the property value sampled at a different time.
Keeping the same seed value for wiggle:
seedRandom(1, true);
Converting file to a GIF and compressing using imagemagick and gifsicle:
convert -delay 4 <source> -loop 0 +dither -layers OptimizePlus "${@:3}" gif:- | gifsicle -O3 --dither --lossy=30 --resize-width 640 -V -o <output>.gif
24fps or 25fps - use -delay 4
30 fps - use -delay 3
change --lossy value from 0 to 100 for less or more compression respectively