Is there an actual malus in build time for mass stall?

Hi all,

im just corious about if there is an actual malus for build time when you mass stall?

or slows it just down to the point of the given mass? so all the build power distributes the massincome equivalent to their build power or do you get an additional negative effect on build time?

<generic disclaimer for bad english>

mass is just distributed across projects based on the proportion of build power used. The second option^. So everything just builds slower.
Power stalling is more detrimental in that your mass extractors require power to function.