Higher LCP about 8.8s where server response 0.361s

Shopify App Store
1

Please guide me how to minimize this.

This single request made the LCP high about 8.8s where ttbf is 3.6s on 29th Aug. After troubleshooting the logs, we got the application response time is 0.361s and server response time is 0.361sec. Not sure why the TTBF or LCP is high in the client side, maybe network latency in PG region, or user used slow network.

Also, I am not sure why LCP is 5.13s is showing in the admin UI where in the web vital log we are getting 8.8s, 1.1s and 2.7s logs where the average should be 4.4s. So, how the partner dashboard id showing the 5.13s ?

id    store_domain    store_id    country    page_path             ttfb      cls       lcp       created_at
****  ************    ***         PG         /app/walkthrough      3692.20   0.0183  8836.00    2026-08-29 13:48:31


{"level":"info","ts":1787989622.812066,"logger":"http.log.access.log0","msg":"handled request","request":{"remote_ip":"***.***.***.***","remote_port":"12488","client_ip":"***.***.***.***","proto":"HTTP/2.0","method":"GET","host":"flexibar.shopiment.io","uri":"/app/walkthrough?admin_theme=admin&embedded=1&hmac=****************************************************************&host=************************************************&id_token=************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************&locale=en&session=****************************************************************&shop=************.myshopify.com&timestamp=1787989618","headers":{"Cf-Visitor":["{\"scheme\":\"https\"}"],"Referer":["https://admin.shopify.com/"],"Priority":["u=0, i"],"Cf-Ipcountry":["PG"],"Sec-Ch-Ua-Mobile":["?0"],"Cdn-Loop":["cloudflare; loops=1"],"X-Forwarded-Proto":["https"],"X-Forwarded-For":["***.***.***.***"],"Upgrade-Insecure-Requests":["1"],"Accept":["text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7"],"Sec-Fetch-Mode":["navigate"],"Sec-Ch-Ua":["\"Not;A=Brand\";v=\"8\", \"Chromium\";v=\"150\", \"Google Chrome\";v=\"150\""],"Sec-Fetch-Dest":["iframe"],"Accept-Language":["en-US,en;q=0.9"],"Sec-Fetch-Site":["cross-site"],"Sec-Fetch-Storage-Access":["active"],"Sec-Ch-Ua-Platform":["\"Windows\""],"Accept-Encoding":["gzip, br"],"Cf-Connecting-Ip":["***.***.***.***"],"User-Agent":["Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36"],"Cf-Ray":["****************-SYD"]},"tls":{"resumed":false,"version":772,"cipher_suite":4865,"proto":"h2","server_name":"flexibar.shopiment.io"}},"bytes_read":0,"user_id":"","duration":0.361011772,"size":5697,"status":200,"resp_headers":{"Content-Encoding":["br"],"Content-Security-Policy":["\n            default-src 'self';\n            script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.shopify.com;\n            style-src 'self' 'unsafe-inline' https://cdn.shopify.com https://fonts.googleapis.com;\n            font-src 'self' https://fonts.gstatic.com;\n            img-src 'self' data: https://cdn.shopify.com https://*.myshopify.com;\n            connect-src 'self' https://*.myshopify.com https://admin.shopify.com\n                         https://*.heymantle.com wss://*.heymantle.com\n                         https://*.chatwoot.com wss://*.chatwoot.com;\n            frame-ancestors https://*.myshopify.com https://admin.shopify.com;\n        "],"Set-Cookie":["REDACTED"],"Date":["Sat, 29 Aug 2026 07:47:02 GMT"],"Referrer-Policy":["strict-origin-when-cross-origin"],"X-Content-Type-Options":["nosniff"],"Alt-Svc":["h3=\":443\"; ma=2592000"],"Link":["<https://cdn.shopify.com/shopifycloud/app-bridge.js>; rel=\"preload\"; as=\"script\";"],"Content-Type":["text/html; charset=utf-8"],"Vary":["Accept-Encoding"],"Permissions-Policy":["geolocation=(), microphone=(), camera=()"],"Strict-Transport-Security":["max-age=31536000; includeSubDomains; preload"],"Via":["1.1 Caddy"]}}


"0.361011772s 200 GET /app/walkthrough?admin_theme=admin&embedded=1&hmac=****************************************************************&host=************************************************&id_token=************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************&locale=en&session=****************************************************************&shop=************.myshopify.com&timestamp=1787989618"
2

Some users use slower networks, especially in developing countries. I have apps that cater to merchants in those regions and the LCP is significantly higher despite using the exact same tech stack as in my other apps

3

In that case, what could be my approach as Shopify sets the limit for the LCP? How to deal with those slower network zone?

In the initial stage, it is not possible to get more requests which might minimize this case.