# Optimization Tips & Best Practices

_Here are some tips and tricks to get more high-quality players!_

## Make smarter bids

-   Campaign performance is measured by  [eCPM,](/en/faq/most-popular-faqs/)  a combination of a campaign's install rate (IR), clickthrough rate (CTR), and bid, which reflects the overall competitiveness of the campaign.
-   Start bidding aggressively, then adjust your bid based on the amount of traffic you receive.
-   It's more cost-effective to adjust bids down rather than up since low bids negatively impact your eCPM.

[Learn more about bidding](/en/faq/advertising/)



## Target by country

-   Players' spending habits vary by country.  [Adjust your campaign](/en/advertising/advanced/advanced-settings-and-targeting/)  to target countries with more engaged players.
-   Target countries with higher  [fill rates.](/en/faq/publishing/)



## Target by device

-   Target different  [device types](/en/advertising/advanced/advanced-settings-and-targeting/)  separately to see which device your most successful audience uses.
-   When each device type has its own target, it can also have its own bid that can be adjusted to compensate for a target's poor performance.



## Optimize your creatives

-   [Upload multiple creatives](/en/advertising/advanced/advanced-settings-and-targeting/)  and creative sets so you can A/B test.
-   Make sure  [optimized traffic allocation](/en/advertising/advanced/advanced-settings-and-targeting/)  is activated so Chartboost can automatically show users your best-performing creatives.

[Learn how to make your advertising creatives awesome](/en/advertising/creatives/creative-assets/)



## You might also like...

-   [Start an Advertising Campaign:](/en/advertising/campaigns/advertising-campaign/)  Set up a campaign to begin acquiring new users.
-   [Advanced Settings & Targeting:](/en/advertising/advanced/advanced-settings-and-targeting/)  Optimize your campaigns to target the right users.