The applet performs the convolution by adding up all scaled & delayed impulse responses. Procedure goes as follows:

Pick x(t') as a scaled discrete impulse going into the system at time t'

Show the system's response x(t')h(t-t') (scaled & delayed impulse response)

Accumulate x(t')h(t-t') values to y(t)

Repeat above steps for all t where x(t) is defined

1 < Speed < 100
(integer)
1 is the fastest.

0 < frame skip < 5
1 is recommended