The production level attribute affects application security rather than performance. 

This production level and access roles together determine class access — which users can create, update, delete, and otherwise operate on objects of specific classes through Access of Role to Object rules (Rule-Access-Role-Obj rule type).

If your production level of the system is set to 2 instead of 5 in PRODUCTION then I recommend that you change it back to 5 for obvious reasons of not compromising security.

If your primary concern is the system/environment's performance, I recommend that you review each of the links below to identify areas of improvement in your environment and apply them accordingly.

• Performance guidance for production applications - Operating Systems - https://pdn.pega.com/performance-guidance-production-applications-operating-systems/performance-guidance-production
• Performance guidance for production applications - Database - https://pdn.pega.com/performance-guidance-production-applications-database
• Performance guidance for production applications - Application Servers -https://pdn.pega.com/performance-guidance-production-applications-application-servers
• JVM configuration best practices - https://pdn.pega.com/jvm-configuration-best-practices
• Performance guidance for production systems – System Settings - https://pdn.pega.com/performance-guidance-production-systems-system-settings/performance-guidance-production-systems