--- a/gfx/layers/TransactionIdAllocator.h
+++ b/gfx/layers/TransactionIdAllocator.h
@@ -19,19 +19,21 @@ protected:
 public:
   NS_INLINE_DECL_REFCOUNTING(TransactionIdAllocator)
 
   /**
    * Allocate a unique id number for the current refresh tick, can
    * only be called while IsInRefresh().
    *
    * If too many id's are allocated without being returned then
-   * the refresh driver will suspend until they catch up.
+   * the refresh driver will suspend until they catch up. This
+   * "throttling" behaviour can be skipped by passing aThrottle=false.
+   * Otherwise call sites should generally be passing aThrottle=true.
    */
-  virtual uint64_t GetTransactionId() = 0;
+  virtual uint64_t GetTransactionId(bool aThrottle) = 0;
 
   /**
    * Return the transaction id that for the last non-revoked transaction.
    * This allows the caller to tell whether a composite was triggered by
    * a paint that occurred after a call to TransactionId().
    */
   virtual uint64_t LastTransactionId() const = 0;
 

--- a/gfx/layers/client/ClientLayerManager.cpp
+++ b/gfx/layers/client/ClientLayerManager.cpp
@@ -721,17 +721,17 @@ ClientLayerManager::ForwardTransaction(b
     if (mForwarder->GetSyncObject() &&
         mForwarder->GetSyncObject()->IsSyncObjectValid()) {
       mForwarder->GetSyncObject()->FinalizeFrame();
     }
   }
 
   mPhase = PHASE_FORWARD;
 
-  mLatestTransactionId = mTransactionIdAllocator->GetTransactionId();
+  mLatestTransactionId = mTransactionIdAllocator->GetTransactionId(!mIsRepeatTransaction);
   TimeStamp transactionStart;
   if (!mTransactionIdAllocator->GetTransactionStart().IsNull()) {
     transactionStart = mTransactionIdAllocator->GetTransactionStart();
   } else {
     transactionStart = mTransactionStart;
   }
 
   if (gfxPrefs::AlwaysPaint() && XRE_IsContentProcess()) {

--- a/gfx/layers/wr/WebRenderLayerManager.cpp
+++ b/gfx/layers/wr/WebRenderLayerManager.cpp
@@ -431,17 +431,17 @@ WebRenderLayerManager::EndTransactionInt
     }
     scrollData.SetPaintSequenceNumber(mPaintSequenceNumber);
     if (mRoot) {
       PopulateScrollData(scrollData, mRoot.get());
     }
   }
 
   bool sync = mTarget != nullptr;
-  mLatestTransactionId = mTransactionIdAllocator->GetTransactionId();
+  mLatestTransactionId = mTransactionIdAllocator->GetTransactionId(/*aThrottle*/ true);
 
   {
     AutoProfilerTracing
       tracing("Paint", sync ? "ForwardDPTransactionSync":"ForwardDPTransaction");
     WrBridge()->DPEnd(builder, size.ToUnknownSize(), sync, mLatestTransactionId, scrollData);
   }
 
   MakeSnapshotIfRequired(size);

--- a/layout/base/nsRefreshDriver.cpp
+++ b/layout/base/nsRefreshDriver.cpp
@@ -2156,21 +2156,22 @@ nsRefreshDriver::FinishedWaitingForTrans
     AutoProfilerTracing tracing("Paint", "RefreshDriverTick");
     DoRefresh();
   }
   mSkippedPaints = false;
   mWarningThreshold = 1;
 }
 
 uint64_t
-nsRefreshDriver::GetTransactionId()
+nsRefreshDriver::GetTransactionId(bool aThrottle)
 {
   ++mPendingTransaction;
 
-  if (mPendingTransaction >= mCompletedTransaction + 2 &&
+  if (aThrottle &&
+      mPendingTransaction >= mCompletedTransaction + 2 &&
       !mWaitingForTransaction &&
       !mTestControllingRefreshes) {
     mWaitingForTransaction = true;
     mSkippedPaints = false;
     mWarningThreshold = 1;
   }
 
   return mPendingTransaction;

--- a/layout/base/nsRefreshDriver.h
+++ b/layout/base/nsRefreshDriver.h
@@ -312,17 +312,17 @@ public:
    * time.
    *
    * Return `false` if `aJank` needs to be grown to accomodate the
    * data but we didn't have enough memory.
    */
   static bool GetJankLevels(mozilla::Vector<uint64_t>& aJank);
 
   // mozilla::layers::TransactionIdAllocator
-  uint64_t GetTransactionId() override;
+  uint64_t GetTransactionId(bool aThrottle) override;
   uint64_t LastTransactionId() const override;
   void NotifyTransactionCompleted(uint64_t aTransactionId) override;
   void RevokeTransactionId(uint64_t aTransactionId) override;
   void ClearPendingTransactions() override;
   void ResetInitialTransactionId(uint64_t aTransactionId) override;
   mozilla::TimeStamp GetTransactionStart() override;
 
   bool IsWaitingForPaint(mozilla::TimeStamp aTime);