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Performance regression with napi for high concurrency

See original GitHub issue

Bug description

See: https://github.com/prisma/prisma/issues/7382

No napi
{
  min: '25ms',
  max: '617ms',
  sum: '3m 17.5s',
  variance: '13.7s',
  mean: '198ms',
  stddev: '117ms',
  count: 1000,
  median: '160ms',
  p75: '203ms',
  p95: '518ms',
  p99: '601ms',
  p999: '617ms'
}
Napi
{
  min: '94ms',
  max: '436ms',
  sum: '5m 30.1s',
  variance: '1.5s',
  mean: '330ms',
  stddev: '40ms',
  count: 1000,
  median: '338ms',
  p75: '343ms',
  p95: '364ms',
  p99: '379ms',
  p999: '436ms'
}

How to reproduce

https://github.com/vjpr/benchmark-prisma

Expected behavior

No response

Prisma information

https://github.com/prisma/prisma/issues/7382

Environment & setup

OS: macOS
Database: PostgreSQL
Node.js version: 14

Prisma Version

prisma               : 2.25.0-dev.3
@prisma/client       : 2.25.0-dev.3
Current platform     : darwin
Query Engine         : query-engine f3e341280d96d0abc068f97e959ddf01f321a858 (at ../../../nvm/versions/node/v14.2.0/pnpm-global/5/node_modules/.pnpm/@prisma+engines@2.24.0-30.f3e341280d96d0abc068f97e959ddf01f321a858/node_modules/@prisma/engines/query-engine-darwin)
Migration Engine     : migration-engine-cli f3e341280d96d0abc068f97e959ddf01f321a858 (at ../../../nvm/versions/node/v14.2.0/pnpm-global/5/node_modules/.pnpm/@prisma+engines@2.24.0-30.f3e341280d96d0abc068f97e959ddf01f321a858/node_modules/@prisma/engines/migration-engine-darwin)
Introspection Engine : introspection-core f3e341280d96d0abc068f97e959ddf01f321a858 (at ../../../nvm/versions/node/v14.2.0/pnpm-global/5/node_modules/.pnpm/@prisma+engines@2.24.0-30.f3e341280d96d0abc068f97e959ddf01f321a858/node_modules/@prisma/engines/introspection-engine-darwin)
Format Binary        : prisma-fmt f3e341280d96d0abc068f97e959ddf01f321a858 (at ../../../nvm/versions/node/v14.2.0/pnpm-global/5/node_modules/.pnpm/@prisma+engines@2.24.0-30.f3e341280d96d0abc068f97e959ddf01f321a858/node_modules/@prisma/engines/prisma-fmt-darwin)
Default Engines Hash : f3e341280d96d0abc068f97e959ddf01f321a858
Studio               : 0.397.0
Preview Features     : nApi, filterJson