It depends.(posted 8480 days ago)When I asked the same question years ago in rec.photo.something, someone responded me with "it depends." I thought it was because that guy didn't know, and I paid attention to the results I get with different film/developper combinations. Although I didn't repeat all combinations I tried enough number of times to get statistically convincing result, nor did I try to compute the confidence associated with my answer, but my results imply that some developers increase speed or decrease contrast when temperature is raised, whereas some others do the opposite. Some do not seem to be sensitive to temperature change as long as the processing time is appropriatelly compensated.