StringBuilder default constructor in the class library

[Hamada Abdelaziz]

While analyzing GC pressure of a run time, I noticed the top object 
being a char[], upon a closer inspection, it turns out to be a result of 
ObjectStreamClass use of StringBuilder, which is constructed with the 
default size of 16 bytes.  In such case 16 bytes is not a sufficient 
size, which leads to unnecessary garbage and incurs a performance hit.

In a high volume situation this leads to high GC pressure, and in turn, 
non uniform performance.

It's worthwhile revisiting all uses of StringBuilder default constructor 
in the class library and adjusting it appropriately.

Thoughts?