diff --git a/Cargo.toml b/Cargo.toml
index a95b419..cdfad14 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,16 +16,11 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
 ctor = "0.1.20"
+coarsetime = "0.1"
 
 [features]
 atomic = []
 
-[target.'cfg(not(target_os = "wasi"))'.dependencies]
-libc = "0.2"
-
-[target.'cfg(target_os = "wasi")'.dependencies]
-wasi = "0.7"
-
 [dev-dependencies]
 criterion = "0.3"
 quanta = "0.9"
diff --git a/src/coarse_now.rs b/src/coarse_now.rs
deleted file mode 100644
index ed1d5c1..0000000
--- a/src/coarse_now.rs
+++ /dev/null
@@ -1,103 +0,0 @@
-// Copyright 2021 TiKV Project Authors. Licensed under Apache-2.0.
-
-//! Get instant value in nanosecond unit as fast as possible but less precise.
-
-#[allow(unused_imports)]
-use std::mem::MaybeUninit;
-
-#[cfg(windows)]
-extern "system" {
-    pub fn GetTickCount() -> libc::c_ulong;
-}
-
-#[cfg(any(target_os = "macos", target_os = "freebsd"))]
-#[allow(non_camel_case_types)]
-type clockid_t = libc::c_int;
-
-#[cfg(target_os = "macos")]
-const CLOCK_MONOTONIC_RAW_APPROX: clockid_t = 5;
-
-#[cfg(target_os = "macos")]
-extern "system" {
-    pub fn clock_gettime_nsec_np(clk_id: clockid_t) -> u64;
-}
-
-#[cfg(target_os = "freebsd")]
-const CLOCK_MONOTONIC_FAST: clockid_t = 12;
-
-#[cfg(any(target_os = "linux", target_os = "android"))]
-#[inline]
-pub(crate) fn current_cycle() -> u64 {
-    let mut tp = MaybeUninit::<libc::timespec>::uninit();
-    let tp = unsafe {
-        libc::clock_gettime(libc::CLOCK_MONOTONIC_COARSE, tp.as_mut_ptr());
-        tp.assume_init()
-    };
-    tp.tv_sec as u64 * 1_000_000_000 + tp.tv_nsec as u64
-}
-
-#[cfg(target_os = "macos")]
-#[inline]
-pub(crate) fn current_cycle() -> u64 {
-    unsafe { clock_gettime_nsec_np(CLOCK_MONOTONIC_RAW_APPROX) }
-}
-
-#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
-#[inline]
-pub(crate) fn current_cycle() -> u64 {
-    let mut tp = MaybeUninit::<libc::timespec>::uninit();
-    let tp = unsafe {
-        libc::clock_gettime(libc::CLOCK_MONOTONIC_FAST, tp.as_mut_ptr());
-        tp.assume_init()
-    };
-    tp.tv_sec as u64 * 1_000_000_000 + tp.tv_nsec as u64
-}
-
-#[cfg(all(
-    unix,
-    not(any(
-        target_os = "macos",
-        target_os = "linux",
-        target_os = "android",
-        target_os = "freebsd",
-        target_os = "dragonfly"
-    ))
-))]
-#[inline]
-pub(crate) fn current_cycle() -> u64 {
-    let mut tv = MaybeUninit::<libc::timeval>::uninit();
-    let tv = unsafe {
-        libc::gettimeofday(tv.as_mut_ptr(), null_mut());
-        tv.assume_init()
-    };
-    tv.tv_sec as u64 * 1_000_000_000 + tv.tv_usec as u64 * 1_000
-}
-
-#[cfg(windows)]
-#[inline]
-pub(crate) fn current_cycle() -> u64 {
-    let millis = unsafe { GetTickCount() } as u64;
-    millis * 1_000_000
-}
-
-#[cfg(target_os = "wasi")]
-#[inline]
-pub(crate) fn current_cycle() -> u64 {
-    use wasi::wasi_unstable::{clock_time_get, CLOCK_MONOTONIC};
-    clock_time_get(CLOCK_MONOTONIC, 1_000_000).unwrap_or(0)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_now() {
-        let mut prev = current_cycle();
-        for _ in 0..100 {
-            let n = current_cycle();
-            assert!(n >= prev);
-            prev = n;
-        }
-    }
-}
diff --git a/src/lib.rs b/src/lib.rs
index 174c180..d3151a1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -33,7 +33,6 @@
 
 #![cfg_attr(docsrs, feature(doc_cfg))]
 
-mod coarse_now;
 mod instant;
 #[cfg(all(target_os = "linux", any(target_arch = "x86", target_arch = "x86_64")))]
 mod tsc_now;
@@ -61,15 +60,22 @@ pub fn is_tsc_available() -> bool {
 
 #[inline]
 pub(crate) fn current_cycle() -> u64 {
+    let coarse_cycle = || {
+        let coarse = coarsetime::Instant::now_without_cache_update();
+        coarsetime::Duration::from_ticks(coarse.as_ticks()).as_nanos()
+    };
+
     #[cfg(all(target_os = "linux", any(target_arch = "x86", target_arch = "x86_64")))]
-    if is_tsc_available() {
-        tsc_now::current_cycle()
-    } else {
-        coarse_now::current_cycle()
+    {
+        if tsc_now::is_tsc_available() {
+            tsc_now::current_cycle()
+        } else {
+            coarse_cycle()
+        }
     }
     #[cfg(not(all(target_os = "linux", any(target_arch = "x86", target_arch = "x86_64"))))]
     {
-        coarse_now::current_cycle()
+        coarse_cycle()
     }
 }
 
@@ -123,7 +129,7 @@ mod tests {
                 let duration_ns_std = std_instant.elapsed();
 
                 #[cfg(target_os = "windows")]
-                let expect_max_delta_ns = 20_000_000;
+                let expect_max_delta_ns = 40_000_000;
                 #[cfg(not(target_os = "windows"))]
                 let expect_max_delta_ns = 5_000_000;