What is the difference between configure static and shared, in performance?

[linuzboy <linuzboy@xxxxxxxxx>]

What is the difference between configure static and shared, in performance?

For example, if I want to have function of iconv, what is the
difference between compiled-in iconv and iconv.so in performance? Is
it just like apache configuration's 20% slow at startup and 5% slow at
execution ?

If I run php in fastcgi mode, can I avoid the 20% lost ?

And, under the php extension directory, there are two directories.
.../no-debug-non-zts-20050922
.../no-debug-zts-20050922

what is the difference?  I know that zts is Zend Thread Safety. What
is it, and which is better, enable or disable ?  As I know php can not
handle thread by default, and so on it can not run multi request in
one php process.


Another problem, I did not find any way while configuring to set the
zts enable or disable ?  --enable-zts ??