There are many widgets that are very famous. Followers Counter widget is one of them which is made by Tumblr itself. Many Tumblr users don't know about it so here is the whole concept and the code one with proper installation guide.
Yes, It can be happen if you are using outdated and heavy coded Free Tumblr theme. However, If you are using Simple Tumblr Themes then you will experience high loading speed even if you have installed one of these widgets on your Tumblr blog.
Get More Followers for Tumblr
You will not believe me but i have increase significant Tumblr followers in a short time after installing Follower counter widget on one of my Tumblr blog. Your Tumblr blog is new or old or even it has very few traffic, You should install this free Follower Counter widget. Follow the below steps to get beautiful Tumblr Follower Counter.
First of All, Go to this Website and Click on side on the "Log in with Tumblr Account" button from the menu item. Grant the application and allow them to read and write your primary data in the next window.
After logged in with Tumblr account, You will be redirected to another page where you will get the option to generate the Tumblr Follower counter for Public or privately. Public Follower counter widget means all the users and visitors will able to see it and private means only you will be able to see the widget when you will be logged in to your Tumblr account. Choose one of the option for your need.
After choosing one of the above option, Choose Follower Counter design, There are various options available but i would recommend tiny one because it will fit on your Tumblr blog sidebar.
Copy the Widget Code.
Installation of Follower Counter
After copping the widget, Paste it within your sidebar area. If you are not sure where to install this widget then paste the code in the description box under your primary description text.