Expect 2s on CI runs

Author: smnandre

src/Map/tests/Cluster/ClusteringPerformanceTest.php

@@ -85,7 +85,7 @@ private function runPerformanceTest(ClusteringAlgorithmInterface $algorithm, arr
         $algorithm->cluster($points, $zoom);
         $elapsed = microtime(true) - $startTime;
 
-        $this->assertLessThan(1.0, $elapsed, $algorithm::class." took too long: {$elapsed} seconds (zoom {$zoom}, ".\count($points).' points)');
+        $this->assertLessThan(2.0, $elapsed, $algorithm::class." took too long: {$elapsed} seconds (zoom {$zoom}, ".\count($points).' points)');
         // echo $algorithm::class." ($zoom): ".($elapsed * 1000)." ms\n";
     }