Concatenate 10,000 strings: ASPX (VB)
<%@ Page language="VB" debug="false" %>
<%
Response.Write("Start "+CSTR(NOW())+"<br>")
DIM s AS String,i AS Integer,nStart AS Double
nStart=TIMER
s=""
FOR i=1 TO 20000
  s=s+CSTR(i)
NEXT
Response.Write("Done "+CSTR(TIMER-nStart)+" "+CSTR(LEN(s))+"
20,000<br>")
%>
On 850 MHz PIII: 21.6 seconds (longer because strings are recopied)