diff -r 9ef10437bb88 -r eb8504715071 mercurial/configitems.py
--- a/mercurial/configitems.py	Fri Jul 06 00:39:21 2018 +0530
+++ b/mercurial/configitems.py	Fri Jun 22 17:12:24 2018 +0200
@@ -594,7 +594,7 @@
     default=False,
 )
 coreconfigitem('experimental', 'sparse-read.density-threshold',
-    default=0.25,
+    default=0.50,
 )
 coreconfigitem('experimental', 'sparse-read.min-gap-size',
     default='256K',