<html> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> </head> <body text="#000099" bgcolor="#FFFFFF"> I'm using the Intel released Mesa 10.6.3 driver running on an Intel i5-5250U processor with an HD6000 (GT3) integrated GPU. The Mesa driver compiles my small GLSL code very quickly, just a few milliseconds, but the linking phase takes over a minute = 60,800 milliseconds to be exact. The shader then runs just fine. I have the same application and same shader on another platform which has an Nvidia driver for which the linking takes just milliseconds. My GLSL code does have a moderately long switch statement but nothing extreme. What on earth can the linker be doing? </body> </html>