I have this issue too. The game runs smoothly for a few minutes, then the framework drops suddenly, making it unplayable.
My setup is:
Asus GL702 gaming laptop:
Windows 10 Pro 64-bit
Intel Core i7 7700HQ @ 2.80GHz
16.0GB RAM @ 1197MHz
Motherboard: ASUSTeK COMPUTER INC. GL702VMK (U3E1)
Drive C - Windows boot: 238GB SAMSUNG MZVLW256HEHP-000H1 (SSD)
Drive D: - Steam (Baldur's Gate 3) installation drive - 931GB Crucial CT1000MX500SSD1 (SATA (SSD))
Graphics: 2047MB NVIDIA GeForce GTX 1060 (ASUStek Computer Inc)
