diff --git a/apps/settings/composer/composer/autoload_classmap.php b/apps/settings/composer/composer/autoload_classmap.php
index cfa1b1ec0c1..9e929478fd8 100644
--- a/apps/settings/composer/composer/autoload_classmap.php
+++ b/apps/settings/composer/composer/autoload_classmap.php
@@ -127,6 +127,7 @@ return array(
     'OCA\\Settings\\SetupChecks\\PhpOpcacheSetup' => $baseDir . '/../lib/SetupChecks/PhpOpcacheSetup.php',
     'OCA\\Settings\\SetupChecks\\PhpOutdated' => $baseDir . '/../lib/SetupChecks/PhpOutdated.php',
     'OCA\\Settings\\SetupChecks\\PhpOutputBuffering' => $baseDir . '/../lib/SetupChecks/PhpOutputBuffering.php',
+    'OCA\\Settings\\SetupChecks\\PhpSAPI' => $baseDir . '/../lib/SetupChecks/PhpSAPI.php',
     'OCA\\Settings\\SetupChecks\\PushService' => $baseDir . '/../lib/SetupChecks/PushService.php',
     'OCA\\Settings\\SetupChecks\\RandomnessSecure' => $baseDir . '/../lib/SetupChecks/RandomnessSecure.php',
     'OCA\\Settings\\SetupChecks\\ReadOnlyConfig' => $baseDir . '/../lib/SetupChecks/ReadOnlyConfig.php',
diff --git a/apps/settings/composer/composer/autoload_static.php b/apps/settings/composer/composer/autoload_static.php
index 2900792c914..4f3b5a713c4 100644
--- a/apps/settings/composer/composer/autoload_static.php
+++ b/apps/settings/composer/composer/autoload_static.php
@@ -142,6 +142,7 @@ class ComposerStaticInitSettings
         'OCA\\Settings\\SetupChecks\\PhpOpcacheSetup' => __DIR__ . '/..' . '/../lib/SetupChecks/PhpOpcacheSetup.php',
         'OCA\\Settings\\SetupChecks\\PhpOutdated' => __DIR__ . '/..' . '/../lib/SetupChecks/PhpOutdated.php',
         'OCA\\Settings\\SetupChecks\\PhpOutputBuffering' => __DIR__ . '/..' . '/../lib/SetupChecks/PhpOutputBuffering.php',
+        'OCA\\Settings\\SetupChecks\\PhpSAPI' => __DIR__ . '/..' . '/../lib/SetupChecks/PhpSAPI.php',
         'OCA\\Settings\\SetupChecks\\PushService' => __DIR__ . '/..' . '/../lib/SetupChecks/PushService.php',
         'OCA\\Settings\\SetupChecks\\RandomnessSecure' => __DIR__ . '/..' . '/../lib/SetupChecks/RandomnessSecure.php',
         'OCA\\Settings\\SetupChecks\\ReadOnlyConfig' => __DIR__ . '/..' . '/../lib/SetupChecks/ReadOnlyConfig.php',
diff --git a/apps/settings/lib/AppInfo/Application.php b/apps/settings/lib/AppInfo/Application.php
index 09ef7c54bd9..21901c7cfff 100644
--- a/apps/settings/lib/AppInfo/Application.php
+++ b/apps/settings/lib/AppInfo/Application.php
@@ -64,6 +64,7 @@ use OCA\Settings\SetupChecks\PhpModules;
 use OCA\Settings\SetupChecks\PhpOpcacheSetup;
 use OCA\Settings\SetupChecks\PhpOutdated;
 use OCA\Settings\SetupChecks\PhpOutputBuffering;
+use OCA\Settings\SetupChecks\PhpSAPI;
 use OCA\Settings\SetupChecks\PushService;
 use OCA\Settings\SetupChecks\RandomnessSecure;
 use OCA\Settings\SetupChecks\ReadOnlyConfig;
@@ -209,6 +210,7 @@ class Application extends App implements IBootstrap {
 		$context->registerSetupCheck(PhpOpcacheSetup::class);
 		$context->registerSetupCheck(PhpOutdated::class);
 		$context->registerSetupCheck(PhpOutputBuffering::class);
+		$context->registerSetupCheck(PhpSAPI::class);
 		$context->registerSetupCheck(RandomnessSecure::class);
 		$context->registerSetupCheck(ReadOnlyConfig::class);
 		$context->registerSetupCheck(SecurityHeaders::class);
diff --git a/apps/settings/lib/SetupChecks/PhpSAPI.php b/apps/settings/lib/SetupChecks/PhpSAPI.php
new file mode 100644
index 00000000000..59dfaa44253
--- /dev/null
+++ b/apps/settings/lib/SetupChecks/PhpSAPI.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Settings\SetupChecks;
+
+use OCP\IL10N;
+use OCP\IURLGenerator;
+use OCP\SetupCheck\ISetupCheck;
+use OCP\SetupCheck\SetupResult;
+
+class PhpSAPI implements ISetupCheck {
+	public function __construct(
+		private IL10N $l10n,
+		private IURLGenerator $urlGenerator,
+	) {
+	}
+
+	public function getName(): string {
+		return $this->l10n->t('PHP SAPI');
+	}
+
+	public function getCategory(): string {
+		return 'php';
+	}
+
+	public function run(): SetupResult {
+		$sapi_type = php_sapi_name();
+
+		if ($sapi_type === 'fpm-fcgi') {
+			$sapi_max_children_reached = fpm_get_status()['max-children-reached']; // since last restart
+			if ($sapi_max_children_reached === 1) {
+				$sapi_max_children_reached_actual = fpm_get_status()['max-active-processes'];
+				return SetupResult::error($this->l10n->t('Your PHP-FPM pool reached it\'s maximum number of allowed processes (' . $sapi_max_children_reached_actual . ') at least once since your last restart. You may want to increase your pm.max_children value in your PHP-FPM pool configuration to avoid problems such as Gateway Timeouts, client connection errors, and slow performance.'), $this->urlGenerator->linkToDocs('admin-php-fpm'));
+			}
+		}
+
+		return SetupResult::success();
+	}
+}