Timing output in page debug changes?

Hi,

I'm trying to debug a page speed issue.

I'm using define('PERCH_PRODUCTION_MODE', PERCH_DEVELOPMENT); to display the timing output in the page debug. Very useful.

I'm running into an issue, when I first load a page I can clearly see what parts of the page are slow.

Before I make any changes, I reload the page and the timing output changes?

Is this related to php cache? I'm developing locally using MAMP Pro.

Trying to figure out if it's something I need to change in Perch (if so, how?), or is this something I need to resolve in MAMP Pro?

Here's a screenshot showing the page debug on page load and refresh.

Perch information

Perch Runway: 3.0.14
Production mode: Development (10)
Installed apps: content (3.0.14), assets (3.0.14), categories (3.0.14), perch_forms (1.10)
DB driver: PDO
DB tables: perch2_backup_plans (1), perch2_backup_resources (1), perch2_backup_runs (5656), perch2_blog_authors (2), perch2_blog_comments (0), perch2_blog_index (69), perch2_blog_posts (3), perch2_blog_posts_to_tags (0), perch2_blog_sections (1), perch2_blog_tags (0), perch2_blog_webmention_queue (0), perch2_blogs (2), perch2_categories (9), perch2_category_counts (0), perch2_category_sets (5), perch2_collection_index (205383), perch2_collection_items (1192), perch2_collection_revisions (186), perch2_collections (6), perch2_content_index (1803), perch2_content_items (166), perch2_content_locks (0), perch2_content_regions (23), perch2_forms (8), perch2_forms_responses (1431), perch2_jw_activity_log_actions (1266), perch2_menu_items (18), perch2_navigation (2), perch2_navigation_pages (4), perch2_page_routes (29), perch2_page_templates (27), perch2_pages (29), perch2_resource_log (18335), perch2_resource_tags (5), perch2_resources (3043), perch2_resources_to_tags (5), perch2_scheduled_tasks (26), perch2_settings (38), perch2_user_passwords (0), perch2_user_privileges (44), perch2_user_role_buckets (0), perch2_user_role_privileges (27), perch2_user_roles (2), perch2_users (8)
Users: 8
App runtimes:
<?php
    $apps_list = array(
        'perch_forms',

    );
Scheduled tasks for Backup: plan_2 (10 mins)
Editor plug-ins:
H1: ba167287ed9b818e6008ad2765e5121e
L1: 3fabca5af968c99f35bc9d5a1464a963
F1: 3b606135b33e6a102526838f4152a807
headerColour: #000000
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 1
content_collapseList: 1
lang: en-gb
update_2.8.13: done
update_runway_2.8.15: done
headerScheme: dark
update_runway_2.8.13: done
latest_version:
on_sale_version:
dashboard: 0
hide_pwd_reset: 1
content_hideNonEditableRegions: 0
content_frontend_edit: 1
logoPath: /perch/resources/logo.png
perch_blog_update: 5.6
perch_blog_post_url: /blog/post.php?s={postSlug}
update_runway_2.8.16: done
update_runway_2.8.17: done
update_runway_2.8.18: done
update_runway_2.8.24: done
update_runway_2.8.25: done
update_runway_2.8.26: done
update_runway_2.8.27: done
perch_blog_site_name:
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key:
perch_blog_max_spam_days: 0
perch_blog_comment_notify: 0
update_runway_2.8.30: done
jw_activity_log_prune_time: 30
update_runway_2.8.31: done
update_runway_2.8.32: done
update_runway_3.0.8: done
update_runway_3.0.14: done
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_SITEPATH: /Users/stephen/Repositories/my-site
PERCH_DB_USERNAME: root
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: XXXXXX_
PERCH_DB_PREFIX: perch2_
PERCH_EMAIL_FROM: XXXXXXX
PERCH_EMAIL_FROM_NAME: XXXXXXXXX
PERCH_LOGINPATH: /perch
PERCH_PATH: /Users/stephen/Repositories/my-site/perch
PERCH_CORE: /Users/stephen/Repositories/my-site/perch/core
PERCH_RESFILEPATH: /Users/stephen/Repositories/my-site/perch/resources
PERCH_RESPATH: /perch/resources
PERCH_HTML5: 1
PERCH_TZ: Europe/London
PERCH_RWD: 1
PERCH_SCHEDULE_SECRET: XXXXXXXXXXXXX
PERCH_CLEAN_RESOURCES:
PERCH_EMAIL_METHOD: smtp
PERCH_EMAIL_HOST: smtp.mailtrap.io
PERCH_EMAIL_SECURE: tls
PERCH_EMAIL_AUTH: 1
PERCH_EMAIL_PORT: 2525
PERCH_EMAIL_USERNAME: XXXXXXXXXXXXX
PERCH_GMAPS_API_KEY: XXXXXXXXXXXXX
PERCH_PRODUCTION_MODE: 10
PERCH_DEBUG: 1
PERCH_RUNWAY: 1
PERCH_ERROR_MODE: DIE
PERCH_DATE_LONG: %d %B %Y
PERCH_DATE_SHORT: %d %b %Y
PERCH_TIME_SHORT: %H:%M
PERCH_TIME_LONG: %H:%M:%S
PERCH_RUNWAY_ROUTED:
PERCH_STRONG_PASSWORDS:
PERCH_ASSET_VERSION: f704e7442d11292c99b5
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /Users/stephen/Repositories/my-site/perch/templates
PERCH_TEMPLATE_FILTERS:
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_XHTML_MARKUP:
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_STRIPSLASHES:
PERCH_PROGRESSIVE_FLUSH: 1
PERCH_PARANOID:
PERCH_FORCE_SECURE_COOKIES:
PERCH_DEFAULT_BUCKET: default
PERCH_TRANSLATION_ASSIST:
PERCH_PASSWORD_MIN_LENGTH: 6
PERCH_MAX_FAILED_LOGINS: 10
PERCH_AUTH_LOCKOUT_DURATION: 1 HOUR
PERCH_VERIFY_UPLOADS:
PERCH_PRIV_ASSIST:
PERCH_CUSTOM_EDITOR_CONFIGS:
PERCH_ENABLE_EXIF: 1
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
PERCH_APPS_EDITOR_PLUGIN: markitup
PERCH_APPS_EDITOR_MARKUP_LANGUAGE: markdown

Hosting settings

PHP: 7.2.1
Zend: 3.2.0
OS: Darwin
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: mysqlnd 5.0.12-dev - 20150407 - $Id: b396954eeb2d1d9ed7902b8bae237b287f21ad9e $
MySQL server: 5.6.38
Free disk space: 28.98 GB
Extensions: Core, date, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2, calendar, ctype, curl, dom, hash, fileinfo, filter, ftp, gd, SPL, iconv, intl, json, ldap, mbstring, session, standard, mysqlnd, PDO, pdo_mysql, pdo_sqlite, Phar, posix, readline, Reflection, mysqli, SimpleXML, soap, sockets, sodium, exif, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, cgi-fcgi, imap, gettext, pgsql, pdo_pgsql, igbinary, memcached
GD: Yes
ImageMagick: No
PHP max upload size: 32M
PHP max form post size: 8M
PHP memory limit: 128M
Total max uploadable file size: 8M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: Yes
PHP_FCGI_CHILDREN: 4
PWD: /Applications/MAMP/fcgi-bin
PHP_FCGI_MAX_REQUESTS: 200
__CF_USER_TEXT_ENCODING: 0x1F5:0x0:0x2
ORIG_SCRIPT_NAME: /fcgi-bin/php7.2.1.fcgi
ORIG_PATH_TRANSLATED: /Users/stephen/Repositories/my-site/perch/core/settings/diagnostics/index.php
ORIG_PATH_INFO: /perch/core/settings/diagnostics/index.php
ORIG_SCRIPT_FILENAME: /Applications/MAMP/fcgi-bin/php7.2.1.fcgi
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php
REQUEST_URI: /perch/core/settings/diagnostics/?extended
QUERY_STRING: extended
REQUEST_METHOD: GET
SERVER_PROTOCOL: HTTP/1.1
GATEWAY_INTERFACE: CGI/1.1
REDIRECT_URL: /perch/core/settings/diagnostics/index.php
REDIRECT_QUERY_STRING: extended
REMOTE_PORT: 63565
SCRIPT_FILENAME: /Users/stephen/Repositories/my-site/perch/core/settings/diagnostics/index.php
SERVER_ADMIN: you@example.com
DOCUMENT_ROOT: /Users/stephen/Repositories/my-site
REMOTE_ADDR: ::1
SERVER_PORT: 80
SERVER_ADDR: ::1
SERVER_NAME: my-site.test
SERVER_SOFTWARE: Apache
PATH: /usr/bin:/bin:/usr/sbin:/sbin
HTTP_COOKIE: _ga=GA1.2.28092986.1521123071; _gid=GA1.2.545873990.1521123071; cmsa=1; PHPSESSID=3eonbs8191nl2cdms15357k2ie
HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.9
HTTP_ACCEPT_ENCODING: gzip, deflate
HTTP_REFERER: https://my-site.test/perch/core/settings/diagnostics/
HTTP_DNT: 1
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_CONNECTION: keep-alive
HTTP_HOST: my-site.test
REDIRECT_STATUS: 200
REDIRECT_HANDLER: php-fastcgi
FCGI_ROLE: RESPONDER
PHP_SELF: /perch/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1521196003.8488
REQUEST_TIME: 1521196003
argc: 1