The NOAA datacenter seems to have some problems leading to very slow transfers and response times for the GFS datasets. The download partially takes more than 6 hours which means, there's sometimes 2 or more rendering instances running at the same time. Until the problems in the NOAA datacenter are fixed, I will restrict download and redering on the main Saakeskus site to the 18Z run only. At the moment, I'm not restricting the beta site as it doesn't have as complex charts yet and requires much less data download.