Why take more time to render razor pages in MVC 5

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ICSM Computer · Answer

If your Razor views in ASP.NET MVC 5 are taking a long time to render, several factors could be contributing to the delay.and 
Here are some possible reasons and solutions:
1. Large or Inefficient View Rendering
Cause: If your view contains a lot of logic, loops, or unnecessary computations, it can slow down rendering.Solution: Minimize the logic in Razor views and move heavy computations to the controller or service layer.
2. Too Many Partial Views
Cause: Using excessive partial views (@Html.Partial or
@Html.RenderPartial) can slow down rendering, especially if they are inside loops.Solution: Consider using @Html.RenderAction or 
@await Html.PartialAsync (if using async controllers) to optimize partial view rendering.
3. Large ViewData/ViewBag/Model Data
Cause: If you are passing large amounts of data through 
ViewBag, ViewData, or Model, it may slow down rendering.Solution: Paginate data before passing it to the view and avoid sending unnecessary properties.
4. Inefficient Database Calls
Cause: If your view depends on database calls (e.g., via 
ViewBag), slow queries can affect rendering time.Solution: Optimize database queries, use caching, and avoid loading unnecessary data.
5. Lack of Output Caching
Cause: If pages are rendering frequently without caching, performance can suffer.Solution: Use Output Caching to cache frequently accessed views:
[OutputCache(Duration = 60, VaryByParam = "none")]
public ActionResult Index()
{
    return View();
}
6. Inefficient JavaScript and CSS
Cause: Large or unoptimized JavaScript and CSS files can slow down page rendering.Solution:
Use bundling and minification in MVC 5.Remove unused JavaScript and CSS files.Use deferred loading (defer and
async) for JavaScript files.
7. View Compilation Delays
Cause: Razor views are compiled dynamically, which can add overhead.
Solution: Enable pre-compilation of views to reduce runtime compilation overhead.
8. Layout Overhead
Cause: If your _Layout.cshtml has unnecessary computations or includes too many scripts and styles, it can slow down rendering.
Solution: Minimize the number of scripts/styles loaded globally and load them only where needed.
9. Server Performance Issues
Cause: If your server is running on limited resources (CPU, RAM), it can slow down rendering.Solution: Upgrade your hosting plan or optimize server performance by monitoring memory/CPU usage.
10. Large HTML Response Size
Cause: If the generated HTML is too large, it increases rendering time.Solution: Use compression (Gzip) and 
reduce HTML size by optimizing unnecessary markup.
and

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Why take more time to render razor pages in MVC 5

ICSM Computer

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1 Answers

1. Large or Inefficient View Rendering

2. Too Many Partial Views

3. Large ViewData/ViewBag/Model Data

4. Inefficient Database Calls

5. Lack of Output Caching

6. Inefficient JavaScript and CSS

7. View Compilation Delays

8. Layout Overhead

9. Server Performance Issues

10. Large HTML Response Size

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