[gegl] buffer: change default tile size to 128x256

[Øyvind Kolås <ok src gnome org>]

commit dd64bfcfdce168fbddb38752ad4e0d6206e44948
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Jun 4 00:22:55 2014 +0200

    buffer: change default tile size to 128x256
    
    For a three layer large GIMP test document, the debug benchmark of
    revalidating the projection goes from 1.65 seconds to 1.14 seconds after the
    change.

 gegl/gegl-config.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gegl/gegl-config.c b/gegl/gegl-config.c
index a08a830..39d3c82 100644
--- a/gegl/gegl-config.c
+++ b/gegl/gegl-config.c
@@ -189,7 +189,7 @@ gegl_config_class_init (GeglConfigClass *klass)
                                    g_param_spec_int ("tile-height",
                                                      "Tile height",
                                                      "default tile height for created buffers.",
-                                                     0, G_MAXINT, 64,
+                                                     0, G_MAXINT, 256,
                                                      G_PARAM_READWRITE |
                                                      G_PARAM_CONSTRUCT));