No, notices by themselves are not a performance issue and generating them typically doesn’t take considerable resources (there are exceptions if you are replacing error handler – I seen it get slow because of larger output volume and conflicts with antivirus). Of course what they do indicate is potential issues with code quality, which is everything but good for robust performance.
You can try plugins such as P3 for easy first look, but I would recommend to look into more generic PHP profilers, such as Xdebug and XHProf for serious troubleshooting.
Related Posts:
- How can I debug the TTFB in WP?
- What’s the ideal way to profile WordPress memory usage?
- Does a WP site consumes memory resources when there are NO visitors?
- How can WordPress be made more memory efficient?
- How many caching plugins should be used?
- Downsize CPU & DB usage in wordpress
- how to find and correct plugin query performance issues
- WordPress slow even use blank template
- admin.php taking 14 seconds
- Too many index.php files running and eating up all memory
- When should we use Radix sort?
- What is the best way to profile javascript execution?
- How to parallelize downloads across hostnames on WordPress?
- How to parallelize downloads across hostnames on WordPress?
- Steps to optimize WordPress in regard to server load and website speed?
- How well does WordPress scale?
- What are the best practices for using a caching plugin on a shared host?
- What’s the difference between wp_insert_user() and wp_create_user()
- How to fix wordpress slow first time load (Local Server)?
- Localized WordPress is much slower?
- W3 Leverage browser caching not working for google pagespeed [closed]
- Memory needed to host 200 wordpress sites?
- Website is slow: advice on optimization
- $wpdb->get_results leaking memory
- Use override_load_textdomain for cache translation and improve performance
- Combine JS and CSS for WordPress admin
- Any reason why wp_cache_set not to work?
- Will removing revisions positively impact database performance?
- Is WordPress fast enough for a heavy traffic project?
- Extremely slow WordPress website with 6000 posts
- In terms of performance – Is unmanaged VPS better than a managed one – for WP sites?
- Get Y random authors’ ID/Object with more than X number of posts
- Localization / textdomain is slow and chaotic
- Disable Outbound Web Requests
- What should be disabled to run on an internal network with no access to the Internet?
- Does running WordPress on Nginx do “squat” for its performance?
- The effect of spam comments on hosting resource usage (CPU)
- How much will mounting wp-content on a separate NFS server impact performance?
- Image Preloading
- Performance impact of using global $post
- WordPress site is sloooow, but admin is fast….any ideas?
- WordPress Scalability – One Instance or Several?
- What Is The Best Method/Tool To Investigate WordPress Internal Performance?
- cross-host benchmarking with wordpress
- Performance problem with first load
- WordPress Caching On Demand
- Is there a real benefit in using wordpress optimized hosting?
- What is better to use, user meta, custom taxonomies or new database structure? [closed]
- How to disable Vary cache header on W3Total Cache plugin [closed]
- How to preload images through Code Snippets wp_head for specific pages?
- Native Lazy Loading on Safari
- Is it possible to make WordPress PHP faster through caching or compiling it?
- Identify running process that constantly use 5% CPU
- W3 Total Cache: use cache for request with ignorable query string [closed]
- Debugging high CPU usage during periods of inactivity
- How accurate is P3 Plugin profiler
- WordPress as framework
- Fatal error: Allowed memory size of 146800640 bytes exhausted (tried to allocate 57 bytes) in public_html/wp-includes/rewrite.php on line 1561
- Optimizing site speed by localizing paths
- How to optimize on-the-fly theme switching for mobile browsers?
- Timezone is wrong when picking city (Copenhagen)
- Site loading extremely slowly
- High traffic management in WP
- How to check performance of WordPress dashboard
- Horrendously slow admin and pretty slow sites [closed]
- Server technical information and first respond time for WordPress
- Avoid loading Facebook buttons and statistics multiple times
- Performance testing a WordPress site locally?
- Speed optimization on WP site, Remove query strings from static resources [duplicate]
- wordpress extremely slow on NAS
- Offloading cron jobs
- How do you make a site load faster when offloading is not an option?
- how to embed Pdf and Video Without effecting page speed?
- My blog load time on Bluehost and Word press is too much. I have slipped in Google Search Ranking
- WordPress is very slow, even it’s not opening sometimes
- Faster Emails with WP Mail
- How fast can I expect WordPress to be on a fresh install locally?
- What could explain an extremely high TTFB (~20-30s) when not logged in, but then drastically reduced when logged in?
- Page flashes/flickers on every page load
- How can I figure out what is making my WordPress site so slow?
- “edit page” not loading
- Change loading order of blocks
- wp_set_post_terms() seems very slow
- wp_get_attachment_image_src() regenerate custom size images everytime
- Fatal error: Allowed memory size of bytes exhausted (tried to allocate 36 bytes)
- Why is the server response time slowing my site down? [closed]
- Control load order?
- How to handle high load of traffic of my server
- How to preload the entire site with javascript?
- How to improve my site’s loading time?
- Is there a way to pass google webmaster CLS on WordPress website?
- Site load time increased
- WordPress and TTFB (time to first byte) stats
- What’s a good tool for speed benchmarking? [closed]
- WordPress system (hardware) requirements?
- How much server power does Worldpress take? [closed]
- JS/CSS duplicate load and 404 Error [closed]
- TTFB is too slow in back-end [closed]
- What kind of data that 3rd part dependencies using?
- FreeBSD performance tuning: Sysctl parameter, loader.conf, kernel