Dear All, I'm new to boost and trying to use boost.signal in my BCB 5.0 project,everything works fine except my project compilation speed was horribly slow down.Once I included the <signal.hpp>,the compiler have to compile extra thousands line of code even my project is empty.I did put the signal.hpp file in my pre-compiled header and include the static lib, but seems it can't help much. Any suggestion to improve the compliation speed in BCB?VC7.0 seems compile pretty fast. Thx Ben _________________________________________________________________ Linguaphone : Learning English? Get Japanese lessons for FREE http://go.msnserver.com/HK/30476.asp