Hi there. What browser are you using, what platform are you on, what kind of computer have you got, etc?
Cheers,
Alex
Hello, the browser I use is Google, the computer is Window, and the framework I use is Cesium 
Please go to WebGL Report and send the output. Here’s an example from my system:
| Platform: | Win32 |
|---|---|
| Browser User Agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36 Edg/89.0.774.57 |
| Context Name: | webgl |
| GL Version: | WebGL 1.0 (OpenGL ES 2.0 Chromium) |
| Shading Language Version: | WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.0 Chromium) |
| Vendor: | WebKit |
| Renderer: | WebKit WebGL |
| Unmasked Vendor: | Google Inc. |
| Unmasked Renderer: | ANGLE (Intel(R) HD Graphics 530 Direct3D11 vs_5_0 ps_5_0) |
| Antialiasing: | Available |
| ANGLE: | Yes, D3D11 |
| Major Performance Caveat: | No |
| # Vertex Shader |
| Max Vertex Attributes: | 16 |
|---|---|
| Max Vertex Uniform Vectors: | 4096 |
| Max Vertex Texture Image Units: | 16 |
| Max Varying Vectors: | 30 |
| Best float precision: | [-2127, 2127] (23) |
Transform Feedback
Coming in WebGL 2
Rasterizer
| Aliased Line Width Range: | [1, 1] |
|---|---|
| Aliased Point Size Range: | [1, 1024] |
Fragment Shader
| Max Fragment Uniform Vectors: | 1024 |
|---|---|
| Max Texture Image Units: | 16 |
| float/int precision: | highp/highp |
| Best float precision: | [-2127, 2127] (23) |
Framebuffer
| Max Color Buffers: | 8 |
|---|---|
| RGBA Bits: | [8, 8, 8, 8] |
| Depth / Stencil Bits: | [24, 8] |
| Max Render Buffer Size: | 16384 |
| Max Viewport Dimensions: | [32767, 32767] |
Textures
| Max Texture Size: | 16384 |
|---|---|
| Max Cube Map Texture Size: | 16384 |
| Max Combined Texture Image Units: | 32 |
| Max Anisotropy: | 16 |
Uniform Buffers
Coming in WebGL 2|
|Supported Extensions:|
||ANGLE_instanced_arrays|
||EXT_blend_minmax|
||EXT_color_buffer_half_float|
||EXT_disjoint_timer_query|
||EXT_float_blend|
||EXT_frag_depth|
||EXT_shader_texture_lod|
||EXT_texture_compression_bptc|
||EXT_texture_compression_rgtc|
||EXT_texture_filter_anisotropic|
||WEBKIT_EXT_texture_filter_anisotropic|
||EXT_sRGB|
||KHR_parallel_shader_compile|
||OES_element_index_uint|
||OES_fbo_render_mipmap|
||OES_standard_derivatives|
||OES_texture_float|
||OES_texture_float_linear|
||OES_texture_half_float|
||OES_texture_half_float_linear|
||OES_vertex_array_object|
||WEBGL_color_buffer_float|
||WEBGL_compressed_texture_s3tc|
||WEBKIT_WEBGL_compressed_texture_s3tc|
||WEBGL_compressed_texture_s3tc_srgb|
||WEBGL_debug_renderer_info|
||WEBGL_debug_shaders|
||WEBGL_depth_texture|
||WEBKIT_WEBGL_depth_texture|
||WEBGL_draw_buffers|
||WEBGL_lose_context|
||WEBKIT_WEBGL_lose_context|
||WEBGL_multi_draw|