Just one compression worker thread on emscripten.

server/TracyWorker.cpp

@@ -1445,9 +1445,13 @@ Worker::Worker( FileRead& f, EventType::Type eventMask, bool bgTasks )
                 alignas(64) std::atomic<State> state = Available;
             };
 
+#ifdef __EMSCRIPTEN__
+            const int jobs = 1;
+#else
             // Leave one thread for file reader, second thread for dispatch (this thread)
             // Minimum 2 threads to have at least two buffers (one in use, second one filling up)
             const auto jobs = std::max<int>( std::thread::hardware_concurrency() - 2, 2 );
+#endif
             auto td = std::make_unique<TaskDispatch>( jobs );
             auto data = std::make_unique<JobData[]>( jobs );