The residential area in Kunming with a high cost-performance ratio is the Dianchi Lake area. This region offers a combination of scenic beauty, convenient amenities, and relatively affordable housing compared to other upscale areas in Kunming.

The Dianchi Lake area is highly sought after due to its proximity to the scenic Dianchi Lake, which is a major tourist attraction in Kunming. The lake's natural beauty and the area's relatively lower cost of living make it an attractive option for those looking for a balance between quality of life and affordability. According to a report by the Kunming Real Estate Association, the average price per square meter in the Dianchi Lake area is around 10,000 RMB, which is significantly lower than the city's average of 15,000 RMB.

Moreover, the Dianchi Lake area boasts a variety of amenities, including schools, hospitals, and shopping centers. The presence of these facilities contributes to the area's high cost-performance ratio. For instance, the area is home to several international schools, making it a popular choice for expatriates and families with children. Additionally, the nearby hospitals provide quality healthcare services, further enhancing the area's appeal.

Another factor that contributes to the high cost-performance ratio of the Dianchi Lake area is its accessibility. The area is well-connected to the city center through a network of roads and public transportation options, including buses and the Kunming Metro. This ease of access makes it convenient for residents to commute to work or explore other parts of the city.

Furthermore, the Dianchi Lake area has seen significant development in recent years, with new residential complexes and commercial projects being constructed. This development has not only improved the infrastructure but has also increased the area's property values. However, the cost of housing remains relatively affordable compared to other prime locations in Kunming, making it an excellent investment opportunity.

In conclusion, the Dianchi Lake area in Kunming stands out as a residential area with a high cost-performance ratio. Its combination of scenic beauty, convenient amenities, affordable housing, and easy accessibility makes it an attractive option for those looking to settle in Kunming.