Performance Interview Questions

Main process handles OS integration; renderer runs UI. Performance that needs filesystem or native APIs should cross IPC boundaries securely with validated messages.

Disable nodeIntegration in renderers where possible, use context isolation, validate IPC, and apply CSP. Performance must not expose arbitrary code execution from untrusted content.

Code signing, auto-update channels, and platform-specific installers. Test Performance on Windows, macOS, and Linux CI runners before release.

Chrome DevTools for renderer, native profilers for CPU/memory, and logging across processes. Performance bottlenecks may be IPC chatter or heavy sync I/O on the main thread.

Use encrypted local storage or OS credential vaults. Migrate settings schema between app versions so Performance preferences survive upgrades.

Staged rollouts, delta updates, and rollback if crash rates spike. Notify users of breaking Performance changes in release notes.

Register accelerators in main process, keep shortcuts consistent per platform, and ensure Performance actions are reachable without shortcuts for accessibility.

Use the official Electron docs for Performance, language or framework references, and reputable community guides. Bookmark release notes and migration guides when upgrading versions, since Performance behavior can change between releases.

Copying snippets without understanding why Performance works leads to fragile code. Beginners often skip error handling, tests, or edge cases. Slow down, trace execution step by step, and validate assumptions with small experiments.

Start with the problem Performance solves, show a minimal working example, and list the team conventions around it. Point them at official docs and one trusted internal example rather than random snippets.

Performance shows up often in production Electron work—misunderstanding it leads to bugs, performance issues, or security gaps. Interviewers want clear explanations plus practical judgment.

Describe scaffolding a feature, configuring defaults, or validating input where Performance is required. Call out what goes wrong if the team skips conventions around it.

Read the official overview, run a minimal sandbox, learn key terms and common errors, then expand with a small project. Hands-on practice beats memorizing Performance definitions.

Follow team conventions, split concerns into testable units, handle edge cases, and document assumptions. Review similar modules in the codebase, add observability, and ship incrementally with feature flags if Performance is risky.

Map the Performance attack surface (injection, broken auth, data exposure, DoS). Layer defenses—validation, rate limits, least privilege, encryption, and regular audits.

Measure first, then improve the hottest Performance paths with batching, connection pooling, async I/O, better algorithms, or sharding. Re-check p95/p99 after each change and skip micro-tweaks without clear gains.

Use expand/contract or strangler patterns, dual-write/dual-read where needed, feature flags, and rollback plans. Validate parity with shadow traffic before decommissioning the old Performance path.

State whether Performance needs strong consistency or can tolerate eventual consistency. Discuss partitions, quorum, conflict resolution, and user-visible anomalies during failures.

Pick availability and latency indicators, set achievable objectives, watch burn rate, and decide when reliability work outranks features. Tie those budgets to release decisions for Performance.

Define clear ownership boundaries for Performance, failure domains, caching, and observability. Plan capacity, multi-region needs if relevant, and explicit trade-offs between consistency, latency, and cost.