diff -r c4b792fa109e -r cce05a6c271f contrib/perf.py
--- a/contrib/perf.py	Fri Dec 18 14:45:28 2020 +0100
+++ b/contrib/perf.py	Wed Jan 13 17:21:51 2021 +0100
@@ -3484,7 +3484,7 @@
             printname = name
             if name is None:
                 printname = b'unfiltered'
-            timer(getbranchmap(name), title=str(printname))
+            timer(getbranchmap(name), title=printname)
     finally:
         branchcacheread.restore()
         branchcachewrite.restore()