To optimize the loading of an infrequently accessed route like an admin dashboard, you should code-split the admin dashboard component and load it asynchronously when users access the route. This approach avoids loading unnecessary code upfront, improving performance. Client-side rendering, bundling with the main bundle, and server-side pre-rendering are not optimal for this scenario.

Implementing a memoization technique like reselect is the most effective strategy for preventing unnecessary re-renders in a large-scale React-Redux application. Reselect allows you to compute derived data efficiently, ensuring that components only re-render when their relevant data changes. While the other options may have their merits, they do not directly address the issue of unnecessary re-renders as effectively as memoization does.

To achieve unique URLs for each blog post without creating a new page component for each post, you can use dynamic routing with Next.js by creating a [slug].js page that fetches the blog content based on the slug. This allows you to use a single page component to display different blog posts dynamically based on the URL. Static site generation (SSG) would create separate HTML files for each post, which is not necessary in this case. The other options are not the most efficient ways to achieve this.

In class components, the method used to fetch new props and state and decide whether a re-render should occur is shouldComponentUpdate. This method allows you to control the re-rendering process by returning true or false based on conditions you specify. It's a key method for optimizing the performance of class components by preventing unnecessary re-renders.

The main purpose of Render Props in React is reusing component logic. This technique allows you to pass a function as a prop to a child component, enabling that child to render something based on the parent's state or logic. It's particularly useful for sharing behavior or functionality between components without tying them to each other. While managing state can be a part of using Render Props, it's not the primary purpose.

To lazily load a component in React, you can use the React.lazy() function. This function allows you to dynamically import a component, which is especially useful for optimizing initial page load times by loading components only when they are needed, reducing the bundle size, and improving performance.

The method that provides detailed information about the error and the component stack where it happened is called componentStack. This information is invaluable when debugging errors in React applications as it helps developers pinpoint the exact location and context of the error. The other options (renderError, componentErrorBoundary, and errorStack) are not standard methods in React for providing this specific information.

In Redux, the function that specifies how the state is transformed by actions is called the "Reducer Function." Reducers take the current state and an action as input and return the new state based on that action. They are a crucial part of the Redux architecture for managing state changes in a predictable and consistent manner.

In React, synthetic events are events created by React to wrap native browser events. They provide a consistent interface for handling events across different browsers. React's synthetic events are used to improve performance and ensure event handling works consistently in React components, abstracting away the differences between browsers.

React's synthetic event system is implemented to ensure consistent behavior across different browsers. It abstracts the differences in how various browsers handle events, providing a unified and predictable interface for event handling in React applications. This helps developers write code that works consistently across different browser environments.