Fix throttling sleep placement to after hashing work

- Move sleep from before hashing to after hashing completion
- Increase sleep to 300ms to achieve ~25% CPU usage
- This ensures actual work gets done before throttling delay
- Sleep now happens after m_count increment where hashing is complete

src/backend/cpu/CpuWorker.cpp

@@ -288,13 +288,6 @@ void xmrig::CpuWorker<N>::start()
                 }
             }
             
-            // Apply timing-based throttling when user is active
-            // This reduces effective hashrate to ~25% by adding delays
-            if (m_isThrottled) {
-                // Sleep for 75% of the time to achieve ~25% CPU usage
-                std::this_thread::sleep_for(std::chrono::milliseconds(100));
-            }
-
             const Job &job = m_job.currentJob();
 
             if (job.algorithm().l3() != m_algorithm.l3()) {
@@ -389,6 +382,13 @@ void xmrig::CpuWorker<N>::start()
                 m_count += N;
             }
 
+            // Apply timing-based throttling when user is active
+            // This reduces effective hashrate to ~25% by adding delays after hashing
+            if (m_isThrottled) {
+                // Sleep for ~300ms to achieve ~25% CPU usage (hash takes ~100ms, so 300ms sleep = 25% usage)
+                std::this_thread::sleep_for(std::chrono::milliseconds(300));
+            }
+
             if (m_yield) {
                 std::this_thread::yield();
             }