Java 输出延迟数据传递

我用SSE打电话给我的客户。通过SSE发送ping请求，客户机通过POST响应该请求。不知何故，我的ping请求常常在客户机上延迟到达。延迟似乎与所使用的ping超时直接相关

客户端类：

public synchronized boolean ping(int timeout){

        final OutboundEvent event = EventFactory.newPingEvent();
        if (eventSink.isClosed()) {
            return false;
        } else {
            try {
                responseReceived.set(false);
                requestTimestamp.set(System.currentTimeMillis());
                eventSink.write(event);
                waitForResponseOrTimeout(timeout);
                boolean clientAnswered = responseReceived.get();
                return result;

            } catch (IOException e) {
                return false;
            }
        }
}

public void onPingResponse() {
    responseReceived.set(true);
    responseTimestamp.set(System.currentTimeMillis());

    synchronized (this) {
        notifyAll();
    }
}
private void waitForResponseOrTimeout(int timeout) {
    boolean timeoutExpired;
    do {
        try {
            synchronized (this) {
                wait(timeout);
            }
        } catch (InterruptedException ex) {
            LOGGER.error("Wait was interrupted", ex);
        }
        timeoutExpired = getElapsedTime() > timeout;
    } while (!(timeoutExpired || responseReceived.get()));
}

REST-API类：

@POST
@Path("{ClientId}")
public void pingResponse(@PathParam("ClientId") String id){
   Client client=getClientById(id);
   client.onPingResponse();
}

这种延误来自何处，如何避免