diff --git a/src/constants.js b/src/constants.js
index c778d1d..40e1181 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -7,7 +7,7 @@ export const runtimes = {
   browser: 'browser',
 }
 
-export const emptyFunction = () => {}
+export const emptyFunction = Object.freeze(() => {})
 
 export const tatamiNgGroup = '$tatami-ng_group'
 
diff --git a/src/lib.js b/src/lib.js
index f50daad..1c78ec1 100644
--- a/src/lib.js
+++ b/src/lib.js
@@ -33,10 +33,6 @@ export const version = (() => {
     node: () => globalThis.process.version,
     deno: () => globalThis.Deno.version.deno,
     bun: () => globalThis.process.versions.bun,
-    // hermes: () =>
-    //   globalThis.HermesInternal?.getRuntimeProperties?.()?.[
-    //     'OSS Release Version'
-    //   ],
   }[runtime]()
 })()
 
diff --git a/src/time.js b/src/time.js
index d27d1f3..c60d6d6 100644
--- a/src/time.js
+++ b/src/time.js
@@ -9,7 +9,8 @@ export const now = (() => {
 
         return () => 1e6 * now()
       } catch {
-        return () => 1e6 * Date.now()
+        const now = Date.now.bind(Date)
+        return () => 1e6 * now()
       }
     },
     browser: () => {
@@ -25,10 +26,22 @@ export const now = (() => {
         return () => 1e6 * $262.agent.monotonicNow()
       } catch {}
 
-      return () => 1e6 * performance.now()
+      return () => {
+        const now = performance.now.bind(performance)
+        return 1e6 * now()
+      }
+    },
+    node: () => () => {
+      const hrtimeNow = process.hrtime.bigint.bind(process)
+      return Number(hrtimeNow())
+    },
+    deno: () => () => {
+      const now = performance.now.bind(performance)
+      return 1e6 * now()
+    },
+    bun: () => {
+      const now = Bun.nanoseconds.bind(Bun)
+      return now
     },
-    node: () => () => Number(process.hrtime.bigint()),
-    deno: () => () => 1e6 * performance.now(),
-    bun: () => Bun.nanoseconds,
   }[runtime]()
 })()
diff --git a/src/utils.js b/src/utils.js
index ff2bc4e..56ccb81 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,3 +1,5 @@
+import { emptyFunction } from './constants.js'
+
 /**
  * Checks if a value is a promise-like object.
  *
@@ -48,7 +50,7 @@ export const isFunctionAsyncResource = fn => {
     if (promiseLike) {
       // silence promise rejection
       try {
-        fnCall.then(() => {})?.catch(() => {})
+        fnCall.then(emptyFunction)?.catch(emptyFunction)
       } catch {
         // ignore
       }