It looks like I don't have specific salary data available for performance bonuses related to Software Engineers at this time. Generally, performance bonuses can vary widely based on the company, the individual's performance, and the overall success of the business.
Many tech companies may offer performance bonuses that range from 5% to 15% of your base salary, but this can be higher in some cases, especially at larger firms or in competitive markets.
If you have a specific company or industry in mind, let me know, and I can help you find more detailed information or salary insights!