Researchers have made a significant breakthrough in the development of fluxonium qubits, a type of superconducting qubit, by exploring the parameters that optimize capacitive cross-resonance gates. The study reveals that a simple formula can be used to calculate the maximum ZX interaction strength, enabling the realization of a CNOT gate in under 200 nanoseconds with minimal residual ZZ errors, limited to 50 kHz, for qubits with frequencies below 1 GHz1. This achievement has significant implications for the field of quantum computing, as it paves the way for the development of more efficient and reliable quantum gates. The analysis was conducted using a semi-analytical method, which involved going beyond the perturbative regime to gain a deeper understanding of the cross-resonance effect. This advancement matters to practitioners because it brings us closer to the development of practical quantum computers that can potentially break current encryption methods, making it essential to reassess the security of cryptographic systems.