Running multiple models on single gpu on PyTorch windows11 (RTX 3090 TI)

Hi there,
Anyone having any experience of running multiple models on a single gpu (RTX 3090 or RTX 3090 TI on PyTorch + windows11 ). I tried running two models to train and it takes double time when i run two separate models in separate power shell on windows (is there any limitations on rtxt 3090 or rtx 3090 TI) ?