Emerging technologies like Fluid Antenna Systems (FAS) are important ingredients toward new generation communications. In particular, we focus on systems based on the reconfigurability capabilities of liquid antennas, which are a subset of FAS that use a liquid as their main conductor. Despite recent pertinent advances in the field, the reconfiguration speed was not directly addressed in the literature, as it is assumed to be very high in most works. However, it is a crucial parameter that defines the system’s capabilities and performance bounds. In addition, a few approaches to spatial correlation modeling are presented here that are also needed for a holistic performance evaluation. Hence, a numerical methodology is proposed to realistically model both parameters. Performance metrics are also addressed, which aid in identifying and comprehending the system’s strengths and weaknesses. The importance of these models and metrics is showcased by reconfiguring the FAS, proposing several algorithms and illustrating their features. As a result, we show that it is possible to obtain a realistic performance evaluation for FAS and improve currently available models and performance to further progress on this topic.