Lower performance when multiple images overlap

## Expected Behavior

Performance should be the same regardless of overlapping images

## Current Behavior

When moving an image and it overlaps the responsiveness of the program decreases.

## Possible Solution

Have some sort of culling engine? (No idea, using my game dev brain)

## Steps to Reproduce (for bugs)

Import multiple images
drag an image on top of one or many images.

## Context

I constantly work with high resolution images and this would make the software a pain to use

## Screenshots of the Problem

https://gfycat.com/elatedpiercingkissingbug

## Your Environment (for bugs)

```
Linux carlos-pc 5.3.0-46-generic #38~18.04.1-Ubuntu SMP Tue Mar 31 04:17:56 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
NAME="elementary OS"
VERSION="5.1.3 Hera"
ID=elementary
ID_LIKE=ubuntu
PRETTY_NAME="elementary OS 5.1.3 Hera"
LOGO=distributor-logo
VERSION_ID="5.1.3"
HOME_URL="https://elementary.io/"
SUPPORT_URL="https://elementary.io/support"
BUG_REPORT_URL="https://github.com/elementary/os/issues/new"
PRIVACY_POLICY_URL="https://elementary.io/privacy-policy"
VERSION_CODENAME=hera
UBUNTU_CODENAME=bionic
```

- Akira Version:
- OS Info: 5.1.3 Hera Elementary Os