diff --git a/src/Runner/Runner.php b/src/Runner/Runner.php
index 5d302d2f..77575ed6 100644
--- a/src/Runner/Runner.php
+++ b/src/Runner/Runner.php
@@ -96,6 +96,7 @@ public function setTempDirectory(?string $path): void
 		}
 
 		$this->tempDir = $path;
+		$this->testHandler->setTempDirectory($path);
 	}
 
 
diff --git a/src/Runner/TestHandler.php b/src/Runner/TestHandler.php
index 0dc78cae..27ffdbf5 100644
--- a/src/Runner/TestHandler.php
+++ b/src/Runner/TestHandler.php
@@ -25,6 +25,9 @@ class TestHandler
 	/** @var Runner */
 	private $runner;
 
+	/** @var string|null */
+	private $tempDir;
+
 
 	public function __construct(Runner $runner)
 	{
@@ -32,6 +35,12 @@ public function __construct(Runner $runner)
 	}
 
 
+	public function setTempDirectory(?string $path): void
+	{
+		$this->tempDir = $path;
+	}
+
+
 	public function initiate(string $file): void
 	{
 		[$annotations, $title] = $this->getAnnotations($file);
@@ -157,28 +166,59 @@ private function initiateMultiple(Test $test, $count): array
 
 	private function initiateTestCase(Test $test, $foo, PhpInterpreter $interpreter)
 	{
-		$job = new Job($test->withArguments(['method' => TestCase::LIST_METHODS]), $interpreter, $this->runner->getEnvironmentVariables());
-		$job->run();
-
-		if (in_array($job->getExitCode(), [Job::CODE_ERROR, Job::CODE_FAIL, Job::CODE_SKIP], true)) {
-			return $test->withResult($job->getExitCode() === Job::CODE_SKIP ? Test::SKIPPED : Test::FAILED, $job->getTest()->stdout);
+		$methods = null;
+
+		if ($this->tempDir) {
+			$cacheFile = $this->tempDir . DIRECTORY_SEPARATOR . 'TestHandler.testCase.' . substr(md5($test->getSignature()), 0, 5) . '.list';
+			if (is_file($cacheFile)) {
+				$cache = unserialize(file_get_contents($cacheFile));
+
+				$valid = true;
+				foreach ($cache['files'] as $path => $mTime) {
+					if (!is_file($path) || filemtime($path) !== $mTime) {
+						$valid = false;
+						break;
+					}
+				}
+				if ($valid) {
+					$methods = $cache['methods'];
+				}
+			}
 		}
 
-		$stdout = $job->getTest()->stdout;
+		if ($methods === null) {
+			$job = new Job($test->withArguments(['method' => TestCase::LIST_METHODS]), $interpreter, $this->runner->getEnvironmentVariables());
+			$job->run();
 
-		if (!preg_match('#^TestCase:([^\n]+)$#m', $stdout, $m)) {
-			return $test->withResult(Test::FAILED, "Cannot list TestCase methods in file '{$test->getFile()}'. Do you call TestCase::run() in it?");
-		}
-		$testCaseClass = $m[1];
+			if (in_array($job->getExitCode(), [Job::CODE_ERROR, Job::CODE_FAIL, Job::CODE_SKIP], true)) {
+				return $test->withResult($job->getExitCode() === Job::CODE_SKIP ? Test::SKIPPED : Test::FAILED, $job->getTest()->stdout);
+			}
+
+			$stdout = $job->getTest()->stdout;
 
-		preg_match_all('#^Method:([^\n]+)$#m', $stdout, $m);
-		if (count($m[1]) < 1) {
-			return $test->withResult(Test::SKIPPED, "Class $testCaseClass in file '{$test->getFile()}' does not contain test methods.");
+			if (!preg_match('#^TestCase:([^\n]+)$#m', $stdout, $m)) {
+				return $test->withResult(Test::FAILED, "Cannot list TestCase methods in file '{$test->getFile()}'. Do you call TestCase::run() in it?");
+			}
+			$testCaseClass = $m[1];
+
+			preg_match_all('#^Method:([^\n]+)$#m', $stdout, $m);
+			if (count($m[1]) < 1) {
+				return $test->withResult(Test::SKIPPED, "Class $testCaseClass in file '{$test->getFile()}' does not contain test methods.");
+			}
+			$methods = $m[1];
+
+			if ($this->tempDir) {
+				preg_match_all('#^Dependency:([^\n]+)$#m', $stdout, $m);
+				file_put_contents($cacheFile, serialize([
+					'methods' => $methods,
+					'files' => array_combine($m[1], array_map('filemtime', $m[1])),
+				]));
+			}
 		}
 
 		return array_map(function (string $method) use ($test): Test {
 			return $test->withArguments(['method' => $method]);
-		}, $m[1]);
+		}, $methods);
 	}