Due to the relatively low server specifications, using SQL's `RAND()` function for randomization is definitely not feasible—it's too slow. Therefore, I changed my approach: I first created a table with two fields—one for the article ID and one for the category ID—and then used this table to perform region-based randomization. This approach enables efficient randomization. However, there's a problem: relying solely on SQL isn't reliable, so I wrote some PHP code. After testing, the homepage loads within two seconds—but...