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superfast
superfast adj. 
/ˌsuːpəˈfast/, /ˌsjuːpəˈfɑːst/, /ˌsjuːpəˈfast/,
Brit. /ˌsuːpəˈfɑːst/
, /ˌsuːpəˈfɑːst//ˌsuːpəˈfast//ˌsjuːpəˈfɑːst//ˌsjuːpəˈfast/U.S. /ˌsupərˈfæst/
/ˌsupərˈfæst/ΚΠ
1911 Evening Rec. (Greenville, Pa.) 13 July 3/1 He was going at a super-fast clip.
1980 Lok Sabha Deb. (India) 5 Aug. 264 A superfast train like the K.K. Express runs late by 5 to 6 hours.
2010 National Infrastructure Plan 2010 (H. M. Treasury) iv. 33 The Government..is committed to the UK having the best superfast broadband network in Europe.
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