Group 1 - The core viewpoint of the article highlights a general decline in computing hardware stocks, including CPO and optical fiber companies, with significant drops in specific stocks like TeFa Information and Tianfu Communication [1] - TeFa Information is approaching a limit down, while Tianfu Communication and Changfei Optical Fiber have both dropped over 5% [1] - Other companies such as Hengtong Optic-Electric and Sihui Fushi are also experiencing pullbacks in their stock prices [1] Group 2 - The decline in these stocks follows a downturn in related stocks like Nvidia, indicating a broader trend in the computing hardware sector [1]