the reason for the slow rendering is the amount of values you have included in this parameter. On desktop all these values are cached while you develop your visualisation; Tableau Server (/Online) needs to fetch all these values.
If you replace the 'dropdown' selection by a 'wildcard' I guess this will run much smoother. Letting people select one of 70.000 values isn't very intuitive; you'd better let them search for it:
Does this solve your problem?
Johan de Groot
nice workaround. thanks