The end-to-end latency between a mobile client and a server can easily surpass 100 ms with a typical cloud service deployment strategy. While such latency usually goes unnoticed when browsing the Web or streaming videos, latency-critical mobile multimedia services, such as cloud gaming and Augmented Reality, may even become unusable. LACRIMOSA will study the end-to-end latency in mobile environments and its impact on the user experience with latency-critical mobile services. It will also investigate how different server deployment strategies and software designs affect the latency and, consequently, the user experience. The expected outcome is measurement methods and models of end-to-end latency and quality of experience (QoE). They are applied in developing a mobile cloud system for latency-critical mobile multimedia services that achieves predictable user experience and optimally balances it with resource consumption and cost.