diff --git a/pyrameter.php b/pyrameter.php
index a3b273a..7e69e7b 100644
--- a/pyrameter.php
+++ b/pyrameter.php
@@ -8,9 +8,9 @@
 return PyrameterConfig::defaults()
     ->usesNamespace('Boundwize\\Pyrameter\\Event\\', TestKind::Functional)
     ->targetShape(
-        unit: ['min' => 60],
-        functional: ['max' => 20],
+        unit: ['min' => 76],
+        functional: ['max' => 8],
         integration: ['max' => 16],
-        e2e: ['max' => 2],
+        e2e: ['max' => 0],
     )
     ->failOnViolation();
diff --git a/src/Analysis/UsageClassifier.php b/src/Analysis/UsageClassifier.php
index a195523..6d312ce 100644
--- a/src/Analysis/UsageClassifier.php
+++ b/src/Analysis/UsageClassifier.php
@@ -11,33 +11,40 @@
 use function array_keys;
 use function ltrim;
 use function sprintf;
-use function str_contains;
 use function str_ends_with;
 use function str_starts_with;
 use function strlen;
+use function strpos;
 use function strtolower;
 use function substr;
 
 final readonly class UsageClassifier
 {
+    /** @var array<string, UsageType> */
+    private const USAGE_TYPES_BY_PREFIX = [
+        'class:'    => UsageType::ClassLike,
+        'function:' => UsageType::Function,
+    ];
+
     /** @var array<string, list<array{kind: TestKind, unless: list<string>}>> */
     private array $exactRules;
 
-    /** @var list<array{usage: string, kind: TestKind, unless: list<string>}> */
-    private array $namespaceRules;
+    /** @var array<string, list<array{usage: string, kind: TestKind, unless: list<string>}>> */
+    private array $namespaceRulesByRoot;
 
     /**
      * @param list<UsageRule> $rules
      */
     public function __construct(array $rules)
     {
-        $exactRules     = [];
-        $namespaceRules = [];
+        $exactRules           = [];
+        $namespaceRulesByRoot = [];
 
         foreach ($rules as $rule) {
             if ($rule->isNamespaceRule()) {
-                $namespaceRules[] = [
-                    'usage'  => $rule->normalizedKey(),
+                $normalizedKey                                                = $rule->normalizedKey();
+                $namespaceRulesByRoot[$this->namespaceRoot($normalizedKey)][] = [
+                    'usage'  => $normalizedKey,
                     'kind'   => $rule->kind,
                     'unless' => $rule->normalizedUnlessKeys(),
                 ];
@@ -51,8 +58,8 @@ public function __construct(array $rules)
             ];
         }
 
-        $this->exactRules     = $exactRules;
-        $this->namespaceRules = $namespaceRules;
+        $this->exactRules           = $exactRules;
+        $this->namespaceRulesByRoot = $namespaceRulesByRoot;
     }
 
     /**
@@ -81,7 +88,9 @@ public function classify(array $consumedUsages): TestKind
                 }
             }
 
-            foreach ($this->namespaceRules as $namespaceRule) {
+            $namespaceRoot = $this->namespaceRoot($normalizedConsumedUsage);
+
+            foreach ($this->namespaceRulesByRoot[$namespaceRoot] ?? [] as $namespaceRule) {
                 if (
                     ! $this->matchesNamespaceRule($normalizedConsumedUsage, $namespaceRule['usage'])
                     || $this->isSuppressed($namespaceRule['unless'], $normalizedConsumedUsages)
@@ -127,21 +136,31 @@ private function matchesNamespaceRule(string $consumedUsage, string $namespaceUs
             && str_starts_with($consumedUsage, $namespaceUsage);
     }
 
+    private function namespaceRoot(string $normalizedUsage): string
+    {
+        $separatorPosition = strpos($normalizedUsage, '\\');
+
+        return $separatorPosition === false
+            ? $normalizedUsage
+            : substr($normalizedUsage, 0, $separatorPosition + 1);
+    }
+
     private function normalizeConsumedUsage(string $consumedUsage): string
     {
-        if (! str_contains($consumedUsage, ':')) {
+        $separatorPosition = strpos($consumedUsage, ':');
+
+        if ($separatorPosition === false) {
             return $this->usageKey(UsageType::ClassLike, $this->normalizeUsageName($consumedUsage));
         }
 
-        foreach (UsageType::cases() as $usageType) {
-            $prefix = $usageType->value . ':';
+        $prefix    = substr($consumedUsage, 0, $separatorPosition + 1);
+        $usageType = self::USAGE_TYPES_BY_PREFIX[$prefix] ?? null;
 
-            if (str_starts_with($consumedUsage, $prefix)) {
-                return $this->usageKey(
-                    $usageType,
-                    $this->normalizeUsageName(substr($consumedUsage, strlen($prefix)))
-                );
-            }
+        if ($usageType !== null) {
+            return $this->usageKey(
+                $usageType,
+                $this->normalizeUsageName(substr($consumedUsage, $separatorPosition + 1))
+            );
         }
 
         return $this->usageKey(UsageType::ClassLike, $this->normalizeUsageName($consumedUsage));
diff --git a/src/Detection/ConsumedUsageVisitor.php b/src/Detection/ConsumedUsageVisitor.php
index 6e06b4d..d16f148 100644
--- a/src/Detection/ConsumedUsageVisitor.php
+++ b/src/Detection/ConsumedUsageVisitor.php
@@ -31,7 +31,6 @@
 use PhpParser\NodeVisitorAbstract;
 
 use function array_keys;
-use function in_array;
 use function ltrim;
 use function sprintf;
 use function strtolower;
@@ -41,13 +40,20 @@ final class ConsumedUsageVisitor extends NodeVisitorAbstract
     /** @var array<string, true> */
     private array $consumedUsages = [];
 
-    /** @var list<string> */
-    private array $mockMethods = [
-        'createMock',
-        'createStub',
-        'createConfiguredMock',
-        'createPartialMock',
-        'getMockBuilder',
+    /** @var array<string, true> */
+    private const MOCK_METHODS = [
+        'createMock'           => true,
+        'createStub'           => true,
+        'createConfiguredMock' => true,
+        'createPartialMock'    => true,
+        'getMockBuilder'       => true,
+    ];
+
+    /** @var array<string, true> */
+    private const RESERVED_CLASS_NAMES = [
+        'self'   => true,
+        'static' => true,
+        'parent' => true,
     ];
 
     public function enterNode(Node $node): null
@@ -189,7 +195,7 @@ private function addUsage(string $usage): void
     {
         $usage = ltrim($usage, '\\');
 
-        if ($usage === '' || in_array(strtolower($usage), ['self', 'static', 'parent'], true)) {
+        if ($usage === '' || isset(self::RESERVED_CLASS_NAMES[strtolower($usage)])) {
             return;
         }
 
@@ -209,7 +215,7 @@ private function isClassConstant(ClassConstFetch $classConstFetch): bool
 
     private function markMockTarget(MethodCall|StaticCall $call): void
     {
-        if (! $call->name instanceof Identifier || ! in_array($call->name->toString(), $this->mockMethods, true)) {
+        if (! $call->name instanceof Identifier || ! isset(self::MOCK_METHODS[$call->name->toString()])) {
             return;
         }
 
diff --git a/src/Rule/UsageRule.php b/src/Rule/UsageRule.php
index 6b41565..587ee96 100644
--- a/src/Rule/UsageRule.php
+++ b/src/Rule/UsageRule.php
@@ -17,6 +17,11 @@
 
 final readonly class UsageRule
 {
+    private string $normalizedUsage;
+
+    /** @var list<string> */
+    private array $normalizedUnlessKeys;
+
     /**
      * @param list<string> $unless
      */
@@ -24,13 +29,24 @@ public function __construct(
         public string $usage,
         public TestKind $kind,
         private UsageType $usageType = UsageType::ClassLike,
-        private array $unless = [],
+        array $unless = [],
     ) {
+        $normalizedUnlessKeys = [];
+
+        foreach ($unless as $unlessUsage) {
+            $normalizedUnlessKeys[] = $this->usageKey(
+                UsageType::ClassLike,
+                $this->normalize($unlessUsage),
+            );
+        }
+
+        $this->normalizedUsage      = $this->normalize($usage);
+        $this->normalizedUnlessKeys = $normalizedUnlessKeys;
     }
 
     public function matches(string $consumedUsage): bool
     {
-        $configuredUsage                     = $this->normalizedUsage();
+        $configuredUsage                     = $this->normalizedUsage;
         [$consumedUsageType, $consumedUsage] = $this->normalizeConsumedUsage($consumedUsage);
 
         if ($consumedUsageType !== $this->usageType) {
@@ -44,19 +60,14 @@ public function matches(string $consumedUsage): bool
         return $this->matchesNamespacePrefix($consumedUsage, $configuredUsage);
     }
 
-    public function normalizedUsage(): string
-    {
-        return $this->normalize($this->usage);
-    }
-
     public function isNamespaceRule(): bool
     {
-        return $this->usageType === UsageType::ClassLike && str_ends_with($this->normalizedUsage(), '\\');
+        return $this->usageType === UsageType::ClassLike && str_ends_with($this->normalizedUsage, '\\');
     }
 
     public function normalizedKey(): string
     {
-        return $this->usageKey($this->usageType, $this->normalizedUsage());
+        return $this->usageKey($this->usageType, $this->normalizedUsage);
     }
 
     /**
@@ -64,13 +75,7 @@ public function normalizedKey(): string
      */
     public function normalizedUnlessKeys(): array
     {
-        $normalizedUnlessKeys = [];
-
-        foreach ($this->unless as $unlessUsage) {
-            $normalizedUnlessKeys[] = $this->usageKey(UsageType::ClassLike, $this->normalize($unlessUsage));
-        }
-
-        return $normalizedUnlessKeys;
+        return $this->normalizedUnlessKeys;
     }
 
     private function normalize(string $usage): string