diff --git a/tests/ParserFrameworkValidationTests.php b/tests/ParserFrameworkValidationTests.php
index 74ca07a2..b696a8df 100644
--- a/tests/ParserFrameworkValidationTests.php
+++ b/tests/ParserFrameworkValidationTests.php
@@ -40,25 +40,33 @@ public function testFrameworkErrors($testCaseFile, $frameworkName) {
         $parser = new \Microsoft\PhpParser\Parser();
         $sourceFile = $parser->parseSourceFile($fileContents);
 
-        $directory = __DIR__ . "/output/$frameworkName/";
-        if (!file_exists($dir = __DIR__ . "/output")) {
-            mkdir($dir);
-        }
-        if (!file_exists($directory)) {
-            mkdir($directory);
-        }
-        $outFile = $directory . basename($testCaseFile);
-        file_put_contents($outFile, $fileContents);
-
-        foreach ($sourceFile->getDescendantNodesAndTokens() as $child) {
-            if ($child instanceof Token) {
-                $this->assertNotEquals(\Microsoft\PhpParser\TokenKind::Unknown, $child->kind, "input: $testCaseFile\r\nexpected: ");
-                $this->assertNotInstanceOf(\Microsoft\PhpParser\SkippedToken::class, $child, "input: $testCaseFile\r\nexpected: ");
-                $this->assertNotInstanceOf(\Microsoft\PhpParser\MissingToken::class, $child, "input: $testCaseFile\r\nexpected: ");
+        try {
+            foreach ($sourceFile->getDescendantNodesAndTokens() as $child) {
+                if ($child instanceof Token) {
+                    if (get_class($child) === Token::class && $child->kind !== \Microsoft\PhpParser\TokenKind::Unknown) {
+                        // NOTE: This parsing many tokens each from 10000+ files - the PHPUnit assert method calls are slow and
+                        // Without this optimization, the test suite takes 93 seconds.
+                        // With this optimization, the method takes 30 seconds.
+                        continue;
+                    }
+                    $this->assertNotEquals(\Microsoft\PhpParser\TokenKind::Unknown, $child->kind, "input: $testCaseFile\r\nexpected: ");
+                    $this->assertNotInstanceOf(\Microsoft\PhpParser\SkippedToken::class, $child, "input: $testCaseFile\r\nexpected: ");
+                    $this->assertNotInstanceOf(\Microsoft\PhpParser\MissingToken::class, $child, "input: $testCaseFile\r\nexpected: ");
+                }
+            }
+        } catch (Throwable $e) {
+            $directory = __DIR__ . "/output/$frameworkName/";
+            if (!file_exists($dir = __DIR__ . "/output")) {
+                mkdir($dir);
+            }
+            if (!file_exists($directory)) {
+                mkdir($directory);
             }
+            $outFile = $directory . basename($testCaseFile);
+            file_put_contents($outFile, $fileContents);
+            throw $e;
         }
 
-        unlink($outFile);
         // echo json_encode($parser->getErrors($sourceFile));
     }
 }