Should I create a splash page??.

If your not talking about a simple pop up page in front of your normal web page, think twice before creating a splash page.

Some people create splash pages that preceed their actual website main page displaying. Though I am not positive what would happen with a splash page in today's search engine, I would avoid them, doubly so if it is a flash page. In past years, search engines (actually the spiders that index your page) penalized people with splash pages. The bots saw minimal information, they could not move past the splash page without performing some operation (such as pressing enter) and the bot would simply not index the page. That meant no visibility for the site unless it was a very special site (lots of backlinks, or you are the only realtor in 60 miles, There are only 2 realtors in 40 miles, or you are the size of AT&T ... silly examples, but, you know what I mean).

Bots have to index millions of sites and a 10 second delay is an eternity to them. If everyone put a 10 second pause in, they would take forever indexing and Google is probably not going to reward you for making their job harder. Even a pause of that nature may affect your indexing.

If you would like to test the concept this year and report back, I would be facinated to know the results ... but, I don't know that is would be worth the risk on an active site, try somewhere you don't care about loosing.

Unless you already have a very special level of importants to Google, that would cause them to want to force indexing of your site, you may want to skip the use of a splash page.