Redmine

I use redmine 1.2.1 to manage my project with subversion control.
When downloading files from "Repository", bigger the file is, longer the time it takes to react(After click downloading, it took 142.9s to start actual download for a 40M file).

Here is the log:
Processing RepositoriesController#entry to raw (for 127.0.0.1 at 2011-11-13 00:4
5:43) [GET]
Parameters: {"format"=>"raw", "action"=>"entry", "id"=>"test", "path"=>["calib
re-0.8.24.msi"], "controller"=>"repositories"}
Sending data calibre-0.8.24.msi
Completed in 142917ms (View: 0, DB: 3) | 200 OK [http://localhost/projects/test/
repository/raw/calibre-0.8.24.msi]

database version: Mysql 5.5.17
Ruby version: 1.8.7 -p330
Rails version: 2.3.14
Redmine version: 1.2.1 stable
scm binary version: subversion 1.6.17

Thank you