id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
3796	GHC 6.12 dependency checking many times slower than 6.10	sunrayser	igloo	"Get feldspar-language-0.1 from hackage and build it:

http://hackage.haskell.org/package/feldspar-language

http://hackage.haskell.org/packages/archive/feldspar-language/0.1/feldspar-language-0.1.tar.gz

Performance:
{{{
""cabal configure; cabal cuild; time cabal build""

6.12:
real    0m24.316s
user    0m24.063s
sys     0m0.159s

6.10:
real    0m2.252s
user    0m2.021s
sys     0m0.231s

""time cabal build"" with 6.10 after ""cabal build""-ing it with 6.12 (ie no ""rm -rf dist"" before building with 6.10)
real    0m24.304s
user    0m24.094s
sys     0m0.139s
}}}
The last one is especially strange.
"	merge	closed	high	6.12.2	Compiler	6.12.1	fixed			Linux	x86	Compile-time performance bug