diff --git a/docs/README.md b/docs/README.md
index 93b4603..92a878e 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,4 +1,3 @@
-
 # Todo
 
 Here some ideas for improving this tiny engine:
@@ -25,3 +24,27 @@ Here some ideas for improving this tiny engine:
 ## Build / Dev Support
 - [ ] add a test rig either with Snitch or Catch2
 - [ ] write some reasonable testcases
+
+
+# Issues
+
+
+
+```sh
+ Performance counter stats for 'bin/paradiso_pong':
+
+            555,35 msec task-clock:u                     #    0,042 CPUs utilized             
+                 0      context-switches:u               #    0,000 /sec                      
+                 0      cpu-migrations:u                 #    0,000 /sec                      
+             4.072      page-faults:u                    #    7,332 K/sec                     
+       319.484.735      cycles:u                         #    0,575 GHz                       
+       358.165.995      instructions:u                   #    1,12  insn per cycle            
+        86.037.942      branches:u                       #  154,926 M/sec                     
+         2.469.068      branch-misses:u                  #    2,87% of all branches           
+
+      13,092775373 seconds time elapsed
+
+       0,311565000 seconds user
+       0,247491000 seconds sys
+```
+above run with `perf stat bin/paradiso_pong` shows some really bad performance issues.
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