<p dir="ltr" style="line-height: 1.38; margin-top: 12pt; margin-bottom: 12pt;">[size= 11pt; font-family: Arial,sans-serif; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap]Complex data models with numerous tables, relationships, and calculated measures can significantly impact performance, making dashboards slow to load. Power BI developers need to carefully design data models, minimizing redundant relationships and optimizing DAX queries. Handling circular dependencies and ambiguous relationships often requires redesigning datasets or creating intermediate tables, increasing development time. Large-scale models also become harder to maintain and troubleshoot, especially when working on collaborative projects. These challenges force developers to spend considerable time on optimization and testing, impacting project timelines and overall scalability.[/size]