No it won't. US for European servers is no problem, round trip of <200ms is hardly noticeable (unless you have a lot of round trips and no CDN). It appears that

No it won't. US for European servers is no problem, round trip of <200ms is hardly noticeable (unless you have a lot of round trips and no CDN). It appears that Google looks at render times (at least that's what they communicate) and it's easy to lose 200ms by having 5 js resources even if the server is close. But Asian visitors will notice a deterioration if you had a server in US-West before. Latency Europe-East Asia/Australia is very high.