Conditional compilation of intermediate language code based on current environment includes loading intermediate language code on a device. Portions of the intermediate language code are conditionally just-in-time compiled based on a current environment of the device. In accordance with certain aspects, intermediate language code is loaded on a device and a current environment of the device is identified. The intermediate language code is modified based on the current environment, and portions of the modified intermediate language code are just-in-time compiled as needed when running the intermediate language code.