diff --git a/libs/display/EInkDisplay/include/EInkDisplay.h b/libs/display/EInkDisplay/include/EInkDisplay.h
index d591ba4a..13a395c7 100644
--- a/libs/display/EInkDisplay/include/EInkDisplay.h
+++ b/libs/display/EInkDisplay/include/EInkDisplay.h
@@ -121,6 +121,17 @@ class EInkDisplay {
   // Power management
   void deepSleep();
 
+  // Optional hooks fired around long BUSY waits. A refresh takes ~0.3-2 s during
+  // which the CPU only polls the BUSY pin; these let host firmware save power in
+  // that window (e.g. reduce the CPU clock) without the SDK knowing the policy.
+  // The begin hook fires once a wait exceeds BUSY_WAIT_HOOK_THRESHOLD_MS (so
+  // short command waits never pay for it); the matching end hook fires when the
+  // wait completes. Plain function pointers; both default to disabled.
+  void setBusyWaitHooks(void (*beginHook)(), void (*endHook)()) {
+    _busyWaitBeginHook = beginHook;
+    _busyWaitEndHook = endHook;
+  }
+
   // Access to frame buffer
   uint8_t* getFrameBuffer() const {
     return frameBuffer;
@@ -133,6 +144,11 @@ class EInkDisplay {
   // Internal geometry setter used by setDisplayX3().
   void setDisplayDimensions(uint16_t width, uint16_t height);
 
+  // Busy-wait hooks (see setBusyWaitHooks)
+  static constexpr unsigned long BUSY_WAIT_HOOK_THRESHOLD_MS = 20;
+  void (*_busyWaitBeginHook)() = nullptr;
+  void (*_busyWaitEndHook)() = nullptr;
+
   // Pin configuration
   int8_t _sclk, _mosi, _cs, _dc, _rst, _busy;
 
diff --git a/libs/display/EInkDisplay/src/EInkDisplay.cpp b/libs/display/EInkDisplay/src/EInkDisplay.cpp
index 3640aad5..4d65cdb3 100644
--- a/libs/display/EInkDisplay/src/EInkDisplay.cpp
+++ b/libs/display/EInkDisplay/src/EInkDisplay.cpp
@@ -579,10 +579,19 @@ void EInkDisplay::waitForRefresh(const char *comment) {
 
 void EInkDisplay::pollBusy(const char *comment, const char *completeWord) {
   unsigned long start = millis();
+  // The begin hook fires lazily, only once the wait has proven long (see
+  // setBusyWaitHooks); hookFired guarantees the end hook is balanced with it.
+  bool hookFired = false;
+  bool x3SawLow = false;
   if (!_x3Mode) {
     // X4: BUSY held HIGH while busy, drops LOW when done.
     while (digitalRead(_busy) == HIGH) {
       delay(1);
+      if (!hookFired && _busyWaitBeginHook != nullptr &&
+          millis() - start > BUSY_WAIT_HOOK_THRESHOLD_MS) {
+        hookFired = true;
+        _busyWaitBeginHook();
+      }
       if (millis() - start > 30000)
         break;
     }
@@ -595,23 +604,29 @@ void EInkDisplay::pollBusy(const char *comment, const char *completeWord) {
     // LOW -> HIGH edge. If we never observe the LOW phase the operation
     // either completed faster than we could see or was a no-op, and we
     // skip the completion log line.
-    bool sawLow = false;
     while (digitalRead(_busy) == HIGH) {
       delay(1);
       if (millis() - start > 1000)
         break;
     }
     if (digitalRead(_busy) == LOW) {
-      sawLow = true;
+      x3SawLow = true;
       while (digitalRead(_busy) == LOW) {
         delay(1);
+        if (!hookFired && _busyWaitBeginHook != nullptr &&
+            millis() - start > BUSY_WAIT_HOOK_THRESHOLD_MS) {
+          hookFired = true;
+          _busyWaitBeginHook();
+        }
         if (millis() - start > 30000)
           break;
       }
     }
-    if (!sawLow)
-      return;
   }
+  if (hookFired && _busyWaitEndHook != nullptr)
+    _busyWaitEndHook();
+  if (_x3Mode && !x3SawLow)
+    return;
   if (comment && Serial)
     Serial.printf("[%lu]   %s: %s (%lu ms)\n", millis(), completeWord, comment,
                   millis() - start);