To increase the loading time in your blog, click the link here.
After got this window, set the property as shown below(by clicking the pictures, can view as big)
now, go to DASHBOARD- LAYOUT- EDITHTML- in your account and then click the DOWNLOAD FULL TEMPLATE and get one back up.
Select and copy the coding in between the EDIT TEMPLATE part. Then paste the coding where the arrow shown as below.
Press the compress-it! button, which shows to the down. After completed compression, it will show one coding, copy the code and again instead of copy it, replace the coding in copy part. Finally you can see the differences in your blog. This is my compression result shown in below.