Increase the elapsed time boundary even further, make the performance…

… test more robust

test/16_recode.jl

@@ -10,12 +10,18 @@ end
 const ≅ = isequal
 
 function test_recode_performance(orig_vec, cat2merge_vec)
-    # the optimized version should take from 20 milliseconds (physical CPU) up to 340 milliseconds
+    # the optimized version should take from 20 milliseconds (physical CPU) up to 600 milliseconds
     # (GitHub actions) while unoptimized version takes > 1 sec
-    # thus setting MAX_RECODE_TIME_IN_SEC to 0.55 seconds seems robust enough
-    MAX_RECODE_TIME_IN_SEC = 0.55
-    recode(orig_vec, cat2merge_vec => "None");
-    time_elapsed = @elapsed recode(orig_vec, cat2merge_vec => "None");
+    # thus setting MAX_RECODE_TIME_IN_SEC to 0.7 seconds seems robust enough
+    MAX_RECODE_TIME_IN_SEC = 0.7
+    MAX_ATTEMPTS = 4
+    time_elapsed = Inf
+    for i_attempt in 1:MAX_ATTEMPTS
+        cur_time_elapsed = @elapsed recode(orig_vec, cat2merge_vec => "None");
+        if cur_time_elapsed < time_elapsed
+            time_elapsed = cur_time_elapsed
+        end
+    end
     @test time_elapsed <= MAX_RECODE_TIME_IN_SEC;
 end