Speed and usability scores by Google PageSpeed Insights.
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- http://error.gmo.jp/contents/setstyle.css -> 685B -> 31%
- https://www.onamae.com/parking.html?_d=a--c--c--o--u--n--t--a--n--t.accountant -> 625B -> 17%
- /images/icon_kumapon.jpg could be reduced by 25KiB (84%)
- /images/icon-fxroid365.jpg could be reduced by 13.4KiB (76%)
- /images/icon_g_gee.jpg could be reduced by 4.9KiB (51%)
- /images/logo_GMO.png could be reduced by 3.1KiB (35%)
- /images/tab0_bg_on.gif could be reduced by 2.6KiB (67%)
- /images/tab1_bg_off.gif could be reduced by 2KiB (55%)
- /images/osusume_appli.png could be reduced by 1.3KiB (35%)
- /images/header_Bg.gif could be reduced by 1.1KiB (88%)
- /images/arrow.gif could be reduced by 1KiB (81%)
- http://error.gmo.jp/contents/setstyle.css
Some html elements are situated too close to each other. Check your mobile layout
Size of all content blocks on the page fit the mobile view-port.