Understanding the optimal amount and balance of macronutrients required by individual insects is a critical prerequisite for enhancing the yield and value of insects used as food and feed. Crickets are amongst the most widely produced edible insects worldwide. Thus, there is a growing need for determining the dietary formulations that optimize survival, growth, intake, food conversion, and body composition in cricket nymphs. Here, we applied nutrient landscape approach to examine the combined and interactive effects of dietary protein and carbohydrate on a suite of nutritional traits in the eight-instar nymphs of two-spotted cricket, Gryllus bimaculatus, confined to one of 24 chemically defined diets that varied in protein-to-carbohydrate (P:C = 5:1, 2:1, 1:1, 1:2, 1:5, 1:8) ratios and protein plus carbohydrate concentrations (P + C = 21, 42, 63, 84%). Food consumption increased with nutrient dilution but this compensatory feeding was incomplete. Food utilization efficiency was maximized on nutritionally concentrated diets with a moderately carbohydrate-biased P:C ratio of 1:1.278. All performance traits were the highest on nutritionally concentrated diets, but at different P:C ratios. Cricket nymphs survived best at a highly protein-biased P:C ratio of 3.861:1. Both body mass at adult eclosion and relative growth rates (RGR) were maximized at carbohydrate-skewed P:C ratios of 1:1.473 and 1:1.470, respectively. When offered a food choice, nymphs self-selected a P:C ratio of 1:1.82, which aligned with the P:C ratios that maximized body mass and RGR. Body composition varied substantially according to dietary protein and carbohydrate, with body protein and lipid content being maximized at the P:C ratio of 1.140:1 and 1:5.562, respectively. Our results have implications for enhancing the rearing conditions of cricket farming through diet optimization.