  The fast timing MPGD is a micro-pattern gaseous detector conceived for
achieving sub-nanosecond time resolution while maintaining the ability to
instrument large areas in high-rate environments; applications of such
technology are perspected in high-energy physics experiments at future
colliders and medical diagnostics with time-of-flight methods. This work shows
the systematic studies carried on an FTM prototype on the performance of GEM
foils coated with resistive DLC films, whose development is essential for the
FTM operation. The resistive foil performance has been tested with several gas
mixtures and compared with the results obtained on conductive foils. The
results show that the performance of the FTM is presently limited by the
technology of manufacturing of DLC-coated GEM foils, with high gains reachable
exclusively in isobuthane-based mixtures.
