I would say if you can do performance testing in a staging environment that's great! For this to make sense he would have to have similar hardware and similar data to test with. You can use apps like loader.io to do benchmarks. APM tools like NewRelic or AppOptics can also be added to staging and you can measure latency, etc. More testing is better, but you can't anticipate everything. Post-deployment monitoring is also equally important. You can do thinks like a canary or blue-green deployment to see how it handles load before deploying everywhere.
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I would say if you can do performance testing in a staging environment that's great! For this to make sense he would have to have similar hardware and similar data to test with. You can use apps like loader.io to do benchmarks. APM tools like NewRelic or AppOptics can also be added to staging and you can measure latency, etc. More testing is better, but you can't anticipate everything. Post-deployment monitoring is also equally important. You can do thinks like a canary or blue-green deployment to see how it handles load before deploying everywhere.