My file has grown from 67 to 127 MB, why?

Rendering V-Ray
1

After a bug that copied 5 time each material in Vray, my file grown to 67 MB to 127 MB… do you know why and how to reduce it ?

thanks

2

It may be an obvious step you tried already: did you try to purge the Vray assets?

3

@emile_francois Could be good if you post an example file where it can be repeated.