diff --git a/.changeset/lemon-steaks-sing.md b/.changeset/lemon-steaks-sing.md
new file mode 100644
index 0000000000..71561c4a29
--- /dev/null
+++ b/.changeset/lemon-steaks-sing.md
@@ -0,0 +1,8 @@
+---
+"effect": patch
+---
+
+if performance.timeOrigin is 0, use performance.now() directly in Clock
+
+This is a workaround for cloudflare, where performance.now() cannot be used in
+the global scope to calculate the origin.
diff --git a/packages/effect/src/internal/clock.ts b/packages/effect/src/internal/clock.ts
index 53b1ce5e72..49d18e5640 100644
--- a/packages/effect/src/internal/clock.ts
+++ b/packages/effect/src/internal/clock.ts
@@ -42,6 +42,8 @@ const performanceNowNanos = (function() {
   const bigint1e6 = BigInt(1_000_000)
   if (typeof performance === "undefined") {
     return () => BigInt(Date.now()) * bigint1e6
+  } else if (typeof performance.timeOrigin === "number" && performance.timeOrigin === 0) {
+    return () => BigInt(Math.round(performance.now() * 1_000_000))
   }
   const origin = (BigInt(Date.now()) * bigint1e6) - BigInt(Math.round(performance.now() * 1_000_000))
   return () => origin + BigInt(Math.round(performance.now() * 1_000_000))