Under RH 6.1 Sparc on an Ultra5 270Mhz + QLogic Antares SCSI, the ld-linux.so.2 library takes 99.9% of the cpu and netscape hangs when I try to open some urls with the "Open Link In new Window" (central mouse button) option. An URL which always reproduces the error is http://www.repubblica.it/ (today's version) whwn I access multiple articles (those on the America's Cup, for example) I can give you an account on the machine, if it's needed. The library always uses a great amount of cpu time, even when netscape doesn't hang. (18% to 60% typical, in single web page browsing) Hope this helps, Giovanni Faglioni, Sys&Net Admin, Comune di Modena.
This is because netscape is being run against the glibc-2.0 compatibility libraries. If you remove the compat-libs and compat-glibc packages, does the problem persist?
Also, one way to alleviate some of the race conditions in netscape (that's what's causing the hangs), is to run netscape through a proxy server, such as squid.