diff --git a/changelog/change_disable_block_given.md b/changelog/change_disable_block_given.md
new file mode 100644
index 000000000..535858d8c
--- /dev/null
+++ b/changelog/change_disable_block_given.md
@@ -0,0 +1 @@
+* [#385](https://github.com/rubocop/rubocop-performance/issues/385): Disable `Performance/BlockGivenWithExplicitBlock` by default. ([@earlopain][])
diff --git a/config/default.yml b/config/default.yml
index 95dc83089..cf44ddf5e 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -32,8 +32,11 @@ Performance/BindCall:
 
 Performance/BlockGivenWithExplicitBlock:
   Description: 'Check block argument explicitly instead of using `block_given?`.'
-  Enabled: pending
+  # This cop was created due to a mistake in microbenchmark.
+  # https://github.com/rubocop/rubocop-performance/issues/385
+  Enabled: false
   VersionAdded: '1.9'
+  VersionChanged: <<next>>
 
 Performance/Caller:
   Description: >-
diff --git a/lib/rubocop/cop/performance/block_given_with_explicit_block.rb b/lib/rubocop/cop/performance/block_given_with_explicit_block.rb
index a3d804694..4fc44169e 100644
--- a/lib/rubocop/cop/performance/block_given_with_explicit_block.rb
+++ b/lib/rubocop/cop/performance/block_given_with_explicit_block.rb
@@ -6,6 +6,9 @@ module Performance
       # Identifies unnecessary use of a `block_given?` where explicit check
       # of block argument would suffice.
       #
+      # NOTE: This cop produces code with significantly worse performance when a
+      # block is being passed to the method and as such should not be enabled.
+      #
       # @example
       #   # bad
       #   def method(&block)