Not really noticed much difference myself. As Dan said a Chassis can take forever to finish and the Gearbox a long time too, nothing out of the ordinary for me though.
Proportionately they speed up to the final stage (so produce 80% of it) in a day or so; then spend more than that time again stuck doing the final 20%.
Mine has been on 80-95% well over a day and a half now. It only took something like 20 hours to get to 80%.
This is on ALL parts. This slowing down of the final stage never happened last season, I just wondered if it was part of a new unannounced update, or a bug.
The start and the end phases of development always take longer than the middle, as per real life. In the same way that the middle part of supplier or sponsor negotiations are quicker than the start and end.
I have parts that are in that phase Dan so will post to let you know when they are done, i dont suspect it's a bug but there may well have been some changes behind the scene. Normally Frank notes these in the status log though.