Image quality optimization during remote isolated sessions

A computer-implemented method for image quality optimization during web isolated sessions, at least a portion of the method being performed by a local browser on a local network device, the local network device comprising one or more processors, the method comprising:

• (a) sending a request to obtain webpage data from a webserver;
• (b) receiving a first portion of the requested webpage data rendered as an image from a remote isolation server, the first portion of the image compressed by a first compression format;
• (c) decompressing the first portion of the image;
• (d) receiving a second horizontal slice or vertical slice of the image from the remote isolation server, the second horizontal slice or vertical slice of the image compressed by a second compression format that is different from the first compression format, the second horizontal slice or vertical slice of the image configured to span all the way across a viewing area of a browser horizontally or vertically but not horizontally and vertically;
• (e) decompressing the second horizontal slice or vertical slice of the image;
• and
• (f) replacing a horizontal slice or vertical slice of the first portion of the image with the second horizontal slice or vertical slice of the image corresponding to the region of the first portion of the image.

One or more non-transitory computer-readable media comprising one or more computer-readable instructions that, when executed by one or more processors of a remote isolation server, cause the remote isolation server to perform a method for image quality optimization during remote isolated sessions, the method comprising:

• (a) receiving, at the remote isolation server, a request from a local browser on a local network device to obtain webpage data from a webserver;
• (b) requesting, to the webserver, the webpage data;
• (c) receiving, from the webserver, the requested webpage data;
• (d) rendering the requested webpage data as an image;
• (e) storing a copy of the image of the requested webpage data in memory associated with the remote isolation server;
• (f) compressing a first portion of the image using a first compression format;
• (g) sending, from the remote isolation server, the compressed first portion of the image to the local browser;
• (h) compressing a second portion of the image using a second compression format that is different from the first compression format, the second portion of the image being a second horizontal slice or vertical slice of the image configured to span all the way across a viewing area of a browser horizontally or vertically but not horizontally and vertically, and wherein a horizontal slice or vertical slice of the first portion of the image is replaceable with the second horizontal slice or vertical slice of the image corresponding to the region of the first portion of the image;
• and
• (i) in response to expiration of a timer-based trigger, sending the compressed second portion of the image to the local browser.