GUIDELINES FOR PHOTO OPTIMIZATION
Following are guidelines for optimizing images. These values are used by professional webmasters who work on big business sites. In most cases, they use the small to medium size images keeping page weight in mind when photos are optimized.
Physical Size
Extremely Large
Very Large
Large
Medium to Large
Small to Medium
Width x Height
1200 x 900
800 x 600
640 x 480
400 x ??
300 x ???
File Size
80k to 100k
60k to 80k
50k to 60k
25k to 50k
10k to 25k
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Approximately every thirty days ( or so) Google spiders begin crawling to archive every site it/they find on the internet. Once the crawling process is complete the information is indexed and is then presented in the next index update.
Google uses multiple servers and when the spiders begin crawling the results across the servers can vary. The Google Dance. You will often see varied results in your site placement during this time. Placement up, placement down but after 3 days (plus or minus) your placement should level off and results will show the same across the servers.
Use the internal search feature to the right or the site map for easy access to information.