In cloud computing, GPUs are dedicated hardware for processing graphics and complex mathematical calculations more efficiently than a standard CPU. Poor performance in graphic-intensive applications typically suggests possible GPU resource constraints or misconfigurations. Answer A is correct because insufficient GPU resources can lead to laggy or unresponsive applications that rely on graphics processing power. Answer B is incorrect, as insufficient CPU resources would affect overall performance, not specifically graphics performance. Answer C is incorrect as replica sets are related to database replication and have no direct impact on graphics performance. Answer D is also incorrect as VLAN configurations primarily affect network segregation and have no direct correlation with GPU performance.