Informix on NT has slow connections

Hello, all: We're evaluating Informix 7.23, running on Windows NT 4.0. We find that when the number of connected users exceeds 100 or so, the amount of time it takes to instantiate a connection increases dramatically and sporadically. Specifically, connecting from a Unix(TM) machine with isql <database@server> << EOF select count(*) from <very_short_table> EOF goes from around 2 seconds to 8 or 12 to 30. There is no pattern to the timing values we measure (i.e., they are not monotonically increasing with system load). The NT performance monitor shows the system is not heavily loaded (low disk I/O, cpu's around 30%). We have not been able to determine whether NT or Informix is the bottleneck. Informix performance, once the connection is established, is very good (i.e., large queries run very fast), and other NT applications on the box run without any apparent degradation as well. Q: Does anyone out there have any experience with this, and any insights to share? Thanks, jk Jon Keck / Systems Engineering Associates / San Diego